JamesC

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:

http://www.thirdgen.org/techboard/fa...eter-gear.html (WC T5 Speedometer Gear Installation)

http://sethirdgen.org/t5speedo.htm

And from DSM where I found a lot of info: http://www.thirdgen.org/techboard/tr...en+gear+sleeve (T-5 speedo gear & sleeve info/question)

JamesC

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maroon88iroc

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

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1988 iroc, 67 RS camaro, 69 firebird, 73 camaro Z28, 95 camaro 6-speed (fs), 86 Z28 (sold), 86 vette & 94 vette (sold)

anesthes

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

Kevin91Z

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.

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355 RWHP, 360 RWTQ
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Pat Hall

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.

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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

JamesC

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

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anesthes

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

Pat Hall

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.

__________________
89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

Kevin91Z

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.

mxcrazed

What would you do for a 2.73?

Pat Hall

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.

__________________
89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

mxcrazed

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!!!

Pat Hall

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.

__________________
89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

mxcrazed

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

tb55chevy

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.

mxcrazed

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)

Pat Hall

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.

__________________
89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

Kevin91Z

I'm running a 7/22 combo, as I said above in post #4.

Tony Walch

I need a scanner, so I can post all the GM tech book drive- driven gear and tire size info I have. 82-92

jimmy92rs

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.

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tilerob79

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?

JamesC

No.

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

JamesC

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"There are more things in heaven and earth, Horatio, / Than are dreamt of in your philosophy." Hamlet
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MY_GTA

"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

Kevin91Z

You need a T5 VSS from an 86-89 Firebird, and you need to find a 7 tooth and 18 tooth speedo gears.

MY_GTA

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?