T-5 Drive/Driven Gear Info--Please Contribute - Third Generation F-Body Message Boards

Go Back  Third Generation F-Body Message Boards > Tech Boards > Transmissions and Drivetrain
Reload this Page >

T-5 Drive/Driven Gear Info--Please Contribute

Transmissions and Drivetrain Need help with your trans? Problems with your axle?

T-5 Drive/Driven Gear Info--Please Contribute

Old 08-14-2007, 04:54 PM
  #1  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
T-5 Drive/Driven Gear Info--Please Contribute

The colors may not be exactly accurate, but I "believe" the tooth count is. Any additional info is appreciated.

3.23's up require a blue 7-tooth drive gear, plus the following driven gear:

18 tooth (p/n 3987918) Brown = 3.23
19 tooth (p/n 3987919) White = 3.42
20 tooth (p/n 3987920) Blue = 3.45
21 tooth (p/n 3987921) Red = 3.73
22 tooth (p/n 3987922) Gray =3.77

3.08 has an 9-tooth drive gear.

Some how-to's for swapping the gears into place:

https://www.thirdgen.org/forums/faq-...eter-gear.html

http://sethirdgen.org/t5speedo.htm

And from DSM where I found a lot of info: https://www.thirdgen.org/forums/tran...en+gear+sleeve

If your speedo cable is leaking at the trans and you replace the sleeve, note the following thumnail or your leak will likely continue (the sleeve for TH350, T-5 and Super T-10 can be found in the link in post #2):

JamesC
Attached Thumbnails T-5 Drive/Driven Gear Info--Please Contribute-speedosleeve.png  

Last edited by JamesC; 10-21-2010 at 08:00 AM. Reason: Johnny Walker Red or Shiner Bock Black
JamesC is offline  
Old 08-14-2007, 09:45 PM
  #2  
Supreme Member
iTrader: (7)
 
maroon88iroc's Avatar
 
Join Date: Mar 2005
Location: mid GA
Posts: 1,926
Car: 88 IROC
Engine: 305 TPI w/ l98 cam
Transmission: T5 5-speed
Axle/Gears: 3.45 posi disc 9 bolt
Re: T-5 Drive/Driven Gear Info--Please Contribute

mods you guys REALLY need to make this a sticky i have spent alot of time researching this and this post by jamesc pretty much sums it up and the links to how to change them is AWESOME!

btw here is the site that you can order the gears from. i didnt see it in your post jamesc.

http://www.transmissioncenter.net/sp...n_______va.htm
maroon88iroc is offline  
Old 10-25-2007, 08:12 AM
  #3  
TGO Supporter/Moderator
iTrader: (12)
 
anesthes's Avatar
 
Join Date: Jul 1999
Location: SALEM, NH
Posts: 10,996
Car: '88 Formula, '94 Corvette, others
Engine: 412" sbc, LT1, etc
Transmission: TH350, 4L60E
Axle/Gears: 10 bolt, 3.42, Dana36 3.07
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by JamesC View Post
The colors may not be exactly accurate, but I "believe" the tooth count is. Any additional info is appreciated.

3.23's up require a blue 7-tooth drive gear, plus the following driven gear:

18 tooth (p/n 3987918) Brown = 3.23
19 tooth (p/n 3987919) White = 3.42
20 tooth (p/n 3987920) Blue = 3.45
21 tooth (p/n 3987921) Red = 3.73
22 tooth (p/n 3987922) Gray =3.77

3.08 has an 9-tooth drive gear.

Some how-to's for swapping the gears into place:

https://www.thirdgen.org/forums/faq-...eter-gear.html

http://sethirdgen.org/t5speedo.htm

And from DSM where I found a lot of info: https://www.thirdgen.org/forums/tran...en+gear+sleeve

JamesC
These part #'s are for mechanical speedo's. (I know, I ordered them yesterday) They are 1pc large plastic gears with integraded rod. If you have an electronic VSS you need just the gear end that slides over the metal shaft.

Does anyone have the part #'s for the VSS gears?

-- Joe
anesthes is offline  
Old 12-12-2007, 02:04 AM
  #4  
Moderator
iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Disneyland, SoCal
Posts: 10,859
Car: 1991 Camaro Z28
Engine: 355 TPI siamesed runners
Transmission: LT1 T56
Axle/Gears: 9-Bolt 3.70
Re: T-5 Drive/Driven Gear Info--Please Contribute

22 tooth is for 4.10 gears, as I just swapped in a 4.10 ratio 9-bolt, and used a 22 tooth gear. The 21 tooth is for 3.70/3.73. 3.77's would be close enough to use the 21 tooth.
Kevin91Z is offline  
Old 12-13-2007, 05:33 AM
  #5  
Supreme Member
iTrader: (31)
 
Join Date: Nov 2000
Location: Roy,UT USA
Posts: 3,347
Re: T-5 Drive/Driven Gear Info--Please Contribute

Hey guys. I was curious to see if I could find any of the metal shaft speedo gear stuff, so I grabbed my f-body parts manual and plugged some part #'s into the gmpartsdirect website, and they do have a couple of things that are still available. 1. Part# 14090580-Gear W/Shaft, Sleeve, Seal-19 Tooth-White: $30.75. 2. Part# 14090595-Gear W/Shaft-22 Tooth-Gray: $15.75. They also have both drive gears available pretty cheap. 1. Part# 14053347-Gear-9 Tooth-Red: $4.04. 2. Part# 14071731-Gear-7 Tooth-Purple: $4.02. I guess if you're looking for just the gear itself to slip on the end of a VSS unit, finding a good used one is still the cheapest way to go. If you need a complete, metal shaft, mechanical drive assembly for a 3.42 geared car, part# 14090580 is somewhat reasonable, considering it'd be brand new. Somebody seriously needs to start reproducing the metal shaft driven gears! I've looked just about everywhere on the web, and they just don't exist. PATC-Raptor corp. has just about every speedo gear ever produced for GM, Ford, and Mopar, except for these. They also carry brand new VSS's for the 700r4's, but no dice for the T5 VSS's.
Pat Hall is offline  
Old 12-13-2007, 06:40 AM
  #6  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by maroon88iroc View Post
btw here is the site that you can order the gears from. i didnt see it in your post jamesc.

http://www.transmissioncenter.net/sp...n_______va.htm
This from the above website:

Speedometer gears for a Chevy TH350 transmission with 26 inch tires and 4.10 gears. 7 tooth drive gear and 22 tooth driven gear. We also have 8, 9 and 10 tooth drive gears, and 17, 18, 19, 20, 21 and 22 tooth driven gears. (The driven gears also fit Super T-10 and Chevy T5 transmissions.)

JamesC
JamesC is offline  
Old 12-13-2007, 07:03 AM
  #7  
TGO Supporter/Moderator
iTrader: (12)
 
anesthes's Avatar
 
Join Date: Jul 1999
Location: SALEM, NH
Posts: 10,996
Car: '88 Formula, '94 Corvette, others
Engine: 412" sbc, LT1, etc
Transmission: TH350, 4L60E
Axle/Gears: 10 bolt, 3.42, Dana36 3.07
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by Pat Hall View Post
Hey guys. I was curious to see if I could find any of the metal shaft speedo gear stuff, so I grabbed my f-body parts manual and plugged some part #'s into the gmpartsdirect website, and they do have a couple of things that are still available. 1. Part# 14090580-Gear W/Shaft, Sleeve, Seal-19 Tooth-White: $30.75. 2. Part# 14090595-Gear W/Shaft-22 Tooth-Gray: $15.75. They also have both drive gears available pretty cheap. 1. Part# 14053347-Gear-9 Tooth-Red: $4.04. 2. Part# 14071731-Gear-7 Tooth-Purple: $4.02. I guess if you're looking for just the gear itself to slip on the end of a VSS unit, finding a good used one is still the cheapest way to go. If you need a complete, metal shaft, mechanical drive assembly for a 3.42 geared car, part# 14090580 is somewhat reasonable, considering it'd be brand new. Somebody seriously needs to start reproducing the metal shaft driven gears! I've looked just about everywhere on the web, and they just don't exist. PATC-Raptor corp. has just about every speedo gear ever produced for GM, Ford, and Mopar, except for these. They also carry brand new VSS's for the 700r4's, but no dice for the T5 VSS's.
I'd double check with gmpartsdirect and make sure they actually have them. I went through this a month or two ago, and nobody had them in stock anymore. INCLUDING patc. I ended up finding what I needed out of a v6 trans, but still.

-- Joe
anesthes is offline  
Old 12-16-2007, 02:54 AM
  #8  
Supreme Member
iTrader: (31)
 
Join Date: Nov 2000
Location: Roy,UT USA
Posts: 3,347
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by anesthes View Post
I'd double check with gmpartsdirect and make sure they actually have them. I went through this a month or two ago, and nobody had them in stock anymore. INCLUDING patc. I ended up finding what I needed out of a v6 trans, but still.

-- Joe
The V6 cars in the junkyard are a great place to find the white, 19 tooth driven gear that's correct for the popular 3.42 rear ratio. I've managed to snag 2 or 3 of them from those. Most of them had the metal shaft too, so they work on the VSS units.

Last edited by Pat Hall; 12-16-2007 at 03:13 AM.
Pat Hall is offline  
Old 12-16-2007, 11:29 PM
  #9  
Moderator
iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Disneyland, SoCal
Posts: 10,859
Car: 1991 Camaro Z28
Engine: 355 TPI siamesed runners
Transmission: LT1 T56
Axle/Gears: 9-Bolt 3.70
Re: T-5 Drive/Driven Gear Info--Please Contribute

This website lists speedo gear combinations:
http://www.hanlonmotorsports.com/t5speedo.asp

However its a Ford T5 website, and GM's dont have a 6 tooth or 8 tooth. Their info says 19 tooth for 3.42/3.45, and 20 tooth for 3.55, and 21 tooth for 3.73 with a 7 tooth drive gear.
Kevin91Z is offline  
Old 04-08-2008, 09:32 AM
  #10  
Member
 
mxcrazed's Avatar
 
Join Date: Jan 2007
Location: eastern mass
Posts: 385
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: T-5 Drive/Driven Gear Info--Please Contribute

What would you do for a 2.73?
mxcrazed is offline  
Old 04-09-2008, 03:58 AM
  #11  
Supreme Member
iTrader: (31)
 
Join Date: Nov 2000
Location: Roy,UT USA
Posts: 3,347
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by mxcrazed View Post
What would you do for a 2.73?
Don't take this the wrong way, but the first thing I'd do is chuck the 2.73 rear in favor of 3.08's or better. You're gonna go through a lot of clutch discs running 2.73's with a manual trans. To figure what driven gear you'll need though, you can use the calculator at this site. http://www.5speedtransmissions.com/calculators.html. With a 7 tooth drive gear, it calls for about a 15 tooth driven gear, which I'm not even sure is available. With the red, 9 tooth drive gear, you'll need either a 19 or 20 tooth driven gear depending on your tire size.
Pat Hall is offline  
Old 04-10-2008, 12:24 AM
  #12  
Member
 
mxcrazed's Avatar
 
Join Date: Jan 2007
Location: eastern mass
Posts: 385
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: T-5 Drive/Driven Gear Info--Please Contribute

How do I figure out the margin of error and where can I find a good variety of speed-o gears? I have 28" tires plus 1 red and 1 blue driven gear I guess ill go figure out what drive gears I have. I would do something about rear but it will probably be an ls1 rear eventually. Thanks for all your help pat!!!

Last edited by mxcrazed; 04-10-2008 at 12:48 AM.
mxcrazed is offline  
Old 04-10-2008, 02:25 AM
  #13  
Supreme Member
iTrader: (31)
 
Join Date: Nov 2000
Location: Roy,UT USA
Posts: 3,347
Re: T-5 Drive/Driven Gear Info--Please Contribute

I'm guessing that since you have an 87 Firebird, you probably have the electric VSS type speedo sender. If so, you'll be kinda hard pressed to find driven gears. Nobody so far has been able to point out a place that sells the VSS style gears new. According to that calculator, with 28" tires, you'd need an 18 tooth driven gear along with the red, 9 tooth drive gear to get an accurate speedo reading. The 18 tooth gear was used in cars with 3.23 rears, so if you could find a member that's parting out a T5/3.23 car, you'd be able to get the gear you need. Most of the V6 powered T5 cars got 3.42 rears, which used the white, 19 tooth gear, but some of them got 3.23's, so you've probably got a fairly good chance of being able to get the gear you need. The reason I referred to the V6/T5 cars is that they seem to be way common in the junkyards, so that's probably your best bet for finding that gear. You might want to check and see what gear you have in there now. The 18 tooth is usually brown in color.
Pat Hall is offline  
Old 04-10-2008, 09:19 AM
  #14  
Member
 
mxcrazed's Avatar
 
Join Date: Jan 2007
Location: eastern mass
Posts: 385
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: T-5 Drive/Driven Gear Info--Please Contribute

It is a mechanical setup with the 85 mph speedo, I guess I'll switch the selector shaft when I get the speedo gears in they are easy to find on google and I could also use a 10/20 combo and get the same accuracy. I have had the drive and driven confused I have red and blue drive gears how many teeth are those? I'm really a noob to this lol

Last edited by mxcrazed; 04-10-2008 at 09:33 AM.
mxcrazed is offline  
Old 04-10-2008, 08:49 PM
  #15  
Junior Member
 
Join Date: Jun 2007
Posts: 8
Re: T-5 Drive/Driven Gear Info--Please Contribute

Your not a Noob just confused like me and everyone else with this black art.

Blue is 7 tooth
Red is 9 tooth

I myself am trying to figure out what to run in my T5 with the 4:11's in my 9 inch I just installed. If anyone knows please let me know. I am running a Mechanical speedo it was a 3:4? rear before.

Thanks.
tb55chevy is offline  
Old 04-11-2008, 12:31 AM
  #16  
Member
 
mxcrazed's Avatar
 
Join Date: Jan 2007
Location: eastern mass
Posts: 385
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: T-5 Drive/Driven Gear Info--Please Contribute

Thank you tb55chevy I guess I need a 18 tooth brown drive gear, it is possible that is whats in there I believe the last car it was in was a 700r4---->T5 swap so it could have been recalibrated. to answer your question you figure out your drive and driven gear by plugging your information into the calculator that pat supplied a link to on 4/9/08 above. not all gear combos will be possible not round to the nearest whole number and that is your driven gear (if both gears are available)
mxcrazed is offline  
Old 04-11-2008, 03:29 AM
  #17  
Supreme Member
iTrader: (31)
 
Join Date: Nov 2000
Location: Roy,UT USA
Posts: 3,347
Re: T-5 Drive/Driven Gear Info--Please Contribute

You guys have got it made since you're both running mechanical speedos. The TH350 style driven gears and "bullet" insert work great in a T5, and they're all over ebay for dirt cheap. You can't run a 10/20 combo because the only 2 drive gears available for the GM T5's are the 7 and 9 tooth gears, so your best option would be a 9/18 combo for those 2.73's. You have to remove the tailshaft housing to change the drive gear, it's mounted on the output shaft by a clip, and it's pretty easy to do while the trans is out of the car. Hey tb55, the most common speedo gear combo for 4:11's is 7/22, at least with a 245/50/16 size tire. You can plug your tire size into that calculator, and it'll tell you which combo will be closest. There's a tire size calculator on the left, and the speedo gear calculator on the right.
Pat Hall is offline  
Old 04-11-2008, 06:17 PM
  #18  
Moderator
iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Disneyland, SoCal
Posts: 10,859
Car: 1991 Camaro Z28
Engine: 355 TPI siamesed runners
Transmission: LT1 T56
Axle/Gears: 9-Bolt 3.70
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by tb55chevy View Post
I myself am trying to figure out what to run in my T5 with the 4:11's in my 9 inch I just installed. If anyone knows please let me know. I am running a Mechanical speedo it was a 3:4? rear before.

Thanks.
I'm running a 7/22 combo, as I said above in post #4.
Kevin91Z is offline  
Old 05-13-2008, 08:18 PM
  #19  
Supreme Member
iTrader: (7)
 
TTOP350's Avatar
 
Join Date: Oct 2001
Location: central Il USA
Posts: 9,972
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: T-5 Drive/Driven Gear Info--Please Contribute

I need a scanner, so I can post all the GM tech book drive- driven gear and tire size info I have. 82-92
TTOP350 is online now  
Old 06-30-2008, 05:31 PM
  #20  
Member
iTrader: (3)
 
jimmy92rs's Avatar
 
Join Date: Feb 2007
Location: CT
Posts: 232
Car: 1992 RS
Engine: 01' LS1
Transmission: T56
Axle/Gears: 10 bolt auburn pro posi, 4.10 gears
Re: T-5 Drive/Driven Gear Info--Please Contribute

Does anyone know where to get a VSS upgrade for 4.10 gears? I originally had 3.08s in the rear and now the speedo is off atleast 15-20 mph.
jimmy92rs is offline  
Old 07-19-2008, 07:58 AM
  #21  
Member
 
Join Date: Apr 2008
Location: Daytona Beach
Posts: 129
Car: 1990 Camaro RS
Engine: 305
Transmission: automatic
Re: T-5 Drive/Driven Gear Info--Please Contribute

if i have a 700r4 with new 3.73s and posi , are all the parts #S the same as with the T-5
----------
and where can i get the parts?

Last edited by tilerob79; 07-19-2008 at 08:03 AM. Reason: Automerged Doublepost
tilerob79 is offline  
Old 07-19-2008, 08:30 AM
  #22  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by tilerob79 View Post
if i have a 700r4 with new 3.73s and posi , are all the parts #S the same as with the T-5
----------
and where can i get the parts?
No.

http://www.transmissioncenter.net/sp...n_______va.htm

JamesC
JamesC is offline  
Old 08-05-2008, 12:11 PM
  #23  
Junior Member
iTrader: (1)
 
MY_GTA's Avatar
 
Join Date: Jul 2008
Location: Illinois
Posts: 15
Car: 1989 GTA
Engine: 5.7 l98
Transmission: T5, b&m short throw shifter
Axle/Gears: 3.27 borg warner
Re: T-5 Drive/Driven Gear Info--Please Contribute

"WOW" i think im even more confused than i was before i read all of this, ok question im doing the t5 swap this weekend and i want to have everthing ready, so im getting a t5 from a 91 firebird formula that had a 305 tpi so im guesing it had 3.08 gears, and im putting it in my 89 GTA 350 tpi w/ 3.27 gears, so what will i need? also will i need any connectors? anybody have part #'s
MY_GTA is offline  
Old 08-05-2008, 01:18 PM
  #24  
Moderator
iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Disneyland, SoCal
Posts: 10,859
Car: 1991 Camaro Z28
Engine: 355 TPI siamesed runners
Transmission: LT1 T56
Axle/Gears: 9-Bolt 3.70
Re: T-5 Drive/Driven Gear Info--Please Contribute

You need a T5 VSS from an 86-89 Firebird, and you need to find a 7 tooth and 18 tooth speedo gears.
Kevin91Z is offline  
Old 08-05-2008, 02:06 PM
  #25  
Junior Member
iTrader: (1)
 
MY_GTA's Avatar
 
Join Date: Jul 2008
Location: Illinois
Posts: 15
Car: 1989 GTA
Engine: 5.7 l98
Transmission: T5, b&m short throw shifter
Axle/Gears: 3.27 borg warner
Re: T-5 Drive/Driven Gear Info--Please Contribute

do you know a good place to get those items? would autozone or advance auto have those? and i would have to get a vss for a 86-89 305 tpi right? thanks for such fast reply. and just to make sure, the vss out of my 700r4 wont fit in the t5 right?

Last edited by MY_GTA; 08-05-2008 at 02:15 PM.
MY_GTA is offline  
Old 08-05-2008, 02:31 PM
  #26  
Junior Member
iTrader: (1)
 
MY_GTA's Avatar
 
Join Date: Jul 2008
Location: Illinois
Posts: 15
Car: 1989 GTA
Engine: 5.7 l98
Transmission: T5, b&m short throw shifter
Axle/Gears: 3.27 borg warner
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by JamesC View Post
The colors may not be exactly accurate, but I "believe" the tooth count is. Any additional info is appreciated.

3.23's up require a blue 7-tooth drive gear, plus the following driven gear:

18 tooth (p/n 3987918) Brown = 3.23
19 tooth (p/n 3987919) White = 3.42
20 tooth (p/n 3987920) Blue = 3.45
21 tooth (p/n 3987921) Red = 3.73
22 tooth (p/n 3987922) Gray =3.77

3.08 has an 9-tooth drive gear.

Some how-to's for swapping the gears into place:

https://www.thirdgen.org/forums/faq-...eter-gear.html

http://sethirdgen.org/t5speedo.htm

And from DSM where I found a lot of info: https://www.thirdgen.org/forums/tran...en+gear+sleeve

JamesC
so if i order the 18 tooth gear does it come with a 7 tooth drive gear? cause im not finding a part# or even where to get the 7 tooth drive gear?????

Last edited by MY_GTA; 08-05-2008 at 02:33 PM. Reason: forgot something
MY_GTA is offline  
Old 08-06-2008, 05:40 AM
  #27  
Supreme Member
iTrader: (31)
 
Join Date: Nov 2000
Location: Roy,UT USA
Posts: 3,347
Re: T-5 Drive/Driven Gear Info--Please Contribute

If your donor T5 came from a TPI car, it's highly unlikely that it was running 3.08 gears. The only T5 equipped f-bodies I know of that ever came with the 3.08 ratio were the TBI cars. Chances are a 305 TPI car with a T5 got either 3.23 or 3.42 rearend gears, both of which used a 7 tooth drive gear. Take a flashlight and look in the speedo drive hole in the tailshaft housing. If you have a 7 tooth gear, the color of it will be either blue or purple. The 9 tooth gear is red, so it's pretty easy to see the difference. If you do end up needing a 7 tooth drive gear, PATC Raptor corp. sells them. They have an ebay store. It's only $12, and here's a link. http://cgi.ebay.com/ebaymotors/GM-T5...mZ140115939750 The hard part will be getting an 18 tooth gear that fits the T5 VSS. As far as I know, nobody sells them new, so you'll have to find a used one somewhere.
Pat Hall is offline  
Old 08-06-2008, 06:27 PM
  #28  
Moderator
iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Disneyland, SoCal
Posts: 10,859
Car: 1991 Camaro Z28
Engine: 355 TPI siamesed runners
Transmission: LT1 T56
Axle/Gears: 9-Bolt 3.70
Re: T-5 Drive/Driven Gear Info--Please Contribute

Pat, the 305 5-speed TPI's could come with 3.08 drum brake rear or a 3.42/3.45 disc brake rear, depending on if it had the G92 option or not.
Kevin91Z is offline  
Old 08-07-2008, 09:19 AM
  #29  
Junior Member
iTrader: (1)
 
MY_GTA's Avatar
 
Join Date: Jul 2008
Location: Illinois
Posts: 15
Car: 1989 GTA
Engine: 5.7 l98
Transmission: T5, b&m short throw shifter
Axle/Gears: 3.27 borg warner
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by JamesC View Post
The colors may not be exactly accurate, but I "believe" the tooth count is. Any additional info is appreciated.

3.23's up require a blue 7-tooth drive gear, plus the following driven gear:

18 tooth (p/n 3987918) Brown = 3.23
19 tooth (p/n 3987919) White = 3.42
20 tooth (p/n 3987920) Blue = 3.45
21 tooth (p/n 3987921) Red = 3.73
22 tooth (p/n 3987922) Gray =3.77

3.08 has an 9-tooth drive gear.

Some how-to's for swapping the gears into place:

https://www.thirdgen.org/forums/faq-...eter-gear.html

http://sethirdgen.org/t5speedo.htm

And from DSM where I found a lot of info: https://www.thirdgen.org/forums/tran...en+gear+sleeve

JamesC
ok so if my t5 has a blue 7 tooth drive gear and the car it came out of had 3.23 gears then it will already have a 18 tooth correct? how can i tell what gears the car had from the t5? also will my computer have any trouble's considering it was set up for an auto? what about engine idle? man this stuff is confusing about these drive gears!
MY_GTA is offline  
Old 08-07-2008, 10:02 AM
  #30  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by MY_GTA View Post
ok so if my t5 has a blue 7 tooth drive gear and the car it came out of had 3.23 gears then it will already have a 18 tooth correct? how can i tell what gears the car had from the t5? also will my computer have any trouble's considering it was set up for an auto? what about engine idle? man this stuff is confusing about these drive gears!
Your best bet is to yank the driven gear and take a peek--no guessing that way. No idea about the computer. Idle speed is around 600 or 700 rpm for a manual trans, IIRC.

JamesC
JamesC is offline  
Old 10-13-2008, 12:23 PM
  #31  
Junior Member
 
Join Date: Sep 2008
Location: Nova Scotia
Posts: 78
Car: 85 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.73
Re: T-5 Drive/Driven Gear Info--Please Contribute

So if you already have the right drive gear and you just need to replace the driven gear, do you have to remove the tailshaft?
Hubes is offline  
Old 10-13-2008, 12:31 PM
  #32  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by Hubes View Post
So if you already have the right drive gear and you just need to replace the driven gear, do you have to remove the tailshaft?
No. The driven gear can be accessed from at the side of the tranny where the cable or VSS connects.

JamesC
JamesC is offline  
Old 11-02-2008, 11:59 PM
  #33  
Member
iTrader: (1)
 
RockJay81's Avatar
 
Join Date: Jul 2008
Location: Long Island NY
Posts: 264
Car: 84 Z28......99 TA
Engine: Lq9 6.0... Ls1
Transmission: 4L60E X's 2
Axle/Gears: 3.73 on both
Re: T-5 Drive/Driven Gear Info--Please Contribute

is there any way to make a electro speedo on a 700r4 it would be great to do my speedo broke 3 times already in the past year
RockJay81 is offline  
Old 11-05-2008, 03:29 AM
  #34  
Moderator
iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Disneyland, SoCal
Posts: 10,859
Car: 1991 Camaro Z28
Engine: 355 TPI siamesed runners
Transmission: LT1 T56
Axle/Gears: 9-Bolt 3.70
Re: T-5 Drive/Driven Gear Info--Please Contribute

Not that I know of. The 700R4 speedo VSS is a different size and will not fit.
Kevin91Z is offline  
Old 01-21-2009, 03:29 PM
  #35  
Junior Member
 
Join Date: Jan 2009
Posts: 1
Re: T-5 Drive/Driven Gear Info--Please Contribute

Another great site I think you guys should check out. I use em for parts and Art Carr is always friendly for answering questions when i call him.
California Performance Transmission
webguy247 is offline  
Old 02-13-2009, 03:12 PM
  #36  
Junior Member
 
choekstra17's Avatar
 
Join Date: Jan 2008
Location: Milford, Massachusetts
Posts: 49
Car: 1992 camaro convertible
Engine: 355ci carbed
Transmission: t5 5 speed
Axle/Gears: 10 bolt 4:10 gears
Re: T-5 Drive/Driven Gear Info--Please Contribute

I noticed someone asked if they knew of any place that sold the driven gears for the VSS type T5. The company listed in the begining of the post does sell them. I just ordered the 22 tooth driven gear and 7 tooth drive geat to compensate my 4:10 gears. Again the website is http://www.transmissioncenter.net/sp...n_______va.htm
and I paid 42.00 for the driven and 15 for the drive plus shipping and it came to like 66.00 approx. Hope this helps

Chris
choekstra17 is offline  
Old 06-03-2009, 07:07 PM
  #37  
Junior Member
 
Join Date: Mar 2009
Location: Shippensburg PA
Posts: 2
Car: 92 Firebird
Engine: 305 TBI
Transmission: T-5
Re: T-5 Drive/Driven Gear Info--Please Contribute

Hello, not sure if anyone can help. I have a 92 Firebird that I swapped from 700r4 to t-5 manual. The car has a vss, but the tranny has a 1" mechanical speed sensor. I purchased a 1" vss, but the driven gear is different. The vss has a D shaped shaft about 1" long, and all the gears I get have a square or round shaft that won't fit the vss. Does the gear just fit on the end of the vss, or do I need a gear with a shaft to work. And does anyone know which gear and where to find it. My car is 305 tbi, with 2.73 rear end. Any help would be much appreciated.
Scubaman7337 is offline  
Old 06-04-2009, 07:47 AM
  #38  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Welcome to TGO. Contact the company in the link immediately above.

JamesC
JamesC is offline  
Old 09-15-2009, 03:05 PM
  #39  
Junior Member
 
Join Date: Sep 2008
Location: Nova Scotia
Posts: 78
Car: 85 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.73
Re: T-5 Drive/Driven Gear Info--Please Contribute

the driven gear in my t5 is the one with the metal shaft through a plastic gear. is it possible to convert to an all plastic gear by changing the sleeve that holds it in to the other style? I have some plastic gears and a sleeve out of a muncie laying around, will they work? thanks
Hubes is offline  
Old 09-17-2009, 08:17 AM
  #40  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by Hubes View Post
the driven gear in my t5 is the one with the metal shaft through a plastic gear. is it possible to convert to an all plastic gear by changing the sleeve that holds it in to the other style?
With the correct sleeve and plastic gear, I wouldn't see why not. Keep us posted.

JamesC
JamesC is offline  
Old 09-17-2009, 05:46 PM
  #41  
Junior Member
 
Join Date: Sep 2008
Location: Nova Scotia
Posts: 78
Car: 85 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.73
Re: T-5 Drive/Driven Gear Info--Please Contribute

ok, Im pulling the transmission before i put it away for the winter, so Ill let you know when I put it back together in the spring
Hubes is offline  
Old 12-05-2009, 07:18 PM
  #42  
Junior Member
 
Join Date: Sep 2008
Location: Nova Scotia
Posts: 78
Car: 85 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.73
Re: T-5 Drive/Driven Gear Info--Please Contribute

ok, I didnt actually try to put the gear in place but I compared the metal shaft gear to the all plastic gear. theres a bore in the tranny housing that the gear slides into and the diameter of the all plastic gear and the metal shaft gear is different at this point. there may be enough support in the gear housing, but i dont think an accurate speedo is worth the risk. to try to clarify since its hard without pics, if you look at JamesC's attachment in the 1st post, the little nub on the left of the gear is the part that slides in the bore and is a different diameter. hopefully that makes sense
Hubes is offline  
Old 01-05-2010, 11:30 AM
  #43  
Senior Member
iTrader: (2)
 
Join Date: Sep 2006
Location: Greater D.C. area.
Posts: 440
Car: 89 Camaro RS
Engine: LO3 TBI
Transmission: 700R4 => WC T-5
Axle/Gears: 3.42 Open Diff
Re: T-5 Drive/Driven Gear Info--Please Contribute

Can someone explain to me how to get the correct speedo reading for a VSS equipped car with a 3.42 rear and 26" tires? I'm a bit confused by this thread, I know it's calibrated for a 3.08 from the factory given the year tranny I bought. Do I just need to change the whole VSS or are there gears I change?
Saabster is offline  
Old 01-05-2010, 11:35 AM
  #44  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by Saabster View Post
Can someone explain to me how to get the correct speedo reading for a VSS equipped car with a 3.42 rear and 26" tires? I'm a bit confused by this thread, I know it's calibrated for a 3.08 from the factory given the year tranny I bought. Do I just need to change the whole VSS or are there gears I change?
Swapping from 3.08's to 3.42's will require both a drive gear (VSS) and driven gear swap. I'd phone the following company to inquire about parts:

http://www.transmissioncenter.net/sp...n_______va.htm

JamesC
JamesC is offline  
Old 01-05-2010, 01:58 PM
  #45  
Junior Member
 
squatingeagle's Avatar
 
Join Date: Dec 2008
Location: Mesa, Az
Posts: 68
Car: 91 Z28
Engine: 305 TPI
Transmission: 5 speed
Axle/Gears: 3.23 posi
Re: T-5 Drive/Driven Gear Info--Please Contribute

i have a 91 305 tpi with a 3.08 rear but i just swapped to a 3.23 last week. rockauto.com has the 7 tooth drive gear and the 18 - 22 tooth gears as well cheap. i just ordered them both for about 10 bucks plus shipping. youll have to search the above part numbers to find the 18-22 tooth gears though. to search part #'s you have to click on the second tab. the 7 tooth drive gear is labeled as Speedometer Pinion Bearing under a 91 camaro z28 5.0. hope this helps

p.s. search all forums for rockauto discount codes they are posted all the time by other members
squatingeagle is offline  
Old 01-05-2010, 02:07 PM
  #46  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by squatingeagle View Post
i have a 91 305 tpi with a 3.08 rear but i just swapped to a 3.23 last week. rockauto.com has the 7 tooth drive gear and the 18 - 22 tooth gears as well cheap. i just ordered them both for about 10 bucks plus shipping. youll have to search the above part numbers to find the 18-22 tooth gears though. to search part #'s you have to click on the second tab. the 7 tooth drive gear is labeled as Speedometer Pinion Bearing under a 91 camaro z28 5.0.
Very good to know.

JamesC
JamesC is offline  
Old 01-05-2010, 02:28 PM
  #47  
Junior Member
 
squatingeagle's Avatar
 
Join Date: Dec 2008
Location: Mesa, Az
Posts: 68
Car: 91 Z28
Engine: 305 TPI
Transmission: 5 speed
Axle/Gears: 3.23 posi
Re: T-5 Drive/Driven Gear Info--Please Contribute

JamesC in your experience, how is that t5 standing up to your 350? ive been thinking of doing the same thing, 350 and t5, but ive read some stuff that says the t5 wont last very long.
squatingeagle is offline  
Old 01-05-2010, 04:33 PM
  #48  
Moderator
Thread Starter
iTrader: (5)
 
JamesC's Avatar
 
Join Date: Aug 1999
Location: Lawrence, KS
Posts: 19,099
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by squatingeagle View Post
JamesC in your experience, how is that t5 standing up to your 350? ive been thinking of doing the same thing, 350 and t5, but ive read some stuff that says the t5 wont last very long.
PM sent.

JamesC
JamesC is offline  
Old 01-22-2010, 11:39 PM
  #49  
Junior Member
iTrader: (2)
 
GTA88t5's Avatar
 
Join Date: Dec 2008
Location: Ennis,TX
Posts: 9
Car: 85 Z28
Engine: 350 TPI
Transmission: WC T-5
Axle/Gears: 3.42 drum
Re: T-5 Drive/Driven Gear Info--Please Contribute

Just found this online calculator. You just plug in what drive gear you have, what rear gear ratio you have, and what diameter tire you have .
http://www.bgsoflex.com/speedo1.html
GTA88t5 is offline  
Old 01-28-2010, 03:59 PM
  #50  
Senior Member
iTrader: (2)
 
Join Date: Sep 2006
Location: Greater D.C. area.
Posts: 440
Car: 89 Camaro RS
Engine: LO3 TBI
Transmission: 700R4 => WC T-5
Axle/Gears: 3.42 Open Diff
Re: T-5 Drive/Driven Gear Info--Please Contribute

Originally Posted by mxcrazed View Post
What would you do for a 2.73?
By my math you need a 19.5 tooth driven gear with a 9 tooth driver. So pick a 19 or a 20. I'd go 19, that should make it a little fast.
Saabster is offline  

Thread Tools
Search this Thread
Quick Reply: T-5 Drive/Driven Gear Info--Please Contribute


Advertising
Featured Sponsors
Vendor Directory

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: