autotec101

I just called our AC Delco dealer and the 18 tooth brown driven gear part # 12554183 shows up as obselete.

I have decided to go another route. My bird now has 3.23 rears and 26.25" tires and a blue 7T drive gear and a 22T white gear. Speedo is way too slow. I normally would require a 7T drive and an 18T driven. I am tired of searching for the 18T. my calculations show 7T/22T combo=.318(currently have) 7T/18T combo= .388(desired) 9T/22T combo= .409(next best one) Speedo will show fast for sure but I am hoping not drastic. If I can get it within 5km I am happy. I will post my findings.

GTAman

iTrader: (2)

i have the same problem. i found brown driven gear off of ebay but it's the old, long plastic style which i believe is for a mechanical speedo. I have a electric speedo with VSS. in the days coming up i'm going to try and modify it and cut an interference fit D hole to fit it. when i succeed i'm gonna have one heck of a write up. the brown gear for electric VSS systems are dang near impossible to find. i know PATC sells the white ones and another color.

autotec101

Yes I tried that...didnt work, might if you use a lathe. BUT I did find a used brown gear, put it in and guess what speedo was still too slow, I ended up putting in a red drive gear and my original white driven gear and speed is close to bang on. so Im not sure if half this stuff here is incorrect or if some specs are diff. from car to car.

americanmuscle3

iTrader: (1)

what combination can i use for a 4.56 gear and a 26" tire?

Pat Hall

iTrader: (31)

With the common 7 tooth drive gear found in our T5's, the calculator I used calls for a 25 tooth driven gear, which I'm pretty sure doesn't exist. If you could find any place that offers a 6 tooth drive gear, then a 21 tooth driven would do the job.

Pat Hall

iTrader: (31)

Which gear combo you need is VERY affected by what size tire you're running. Most of the gear combos on this site are usually based on a 245/50/16 size tire. Here's link to the calculator I always use to figure out my speedo gears. It's handy because it has the tire size calculator and speedo gear calculator side by side on the same page, so once you figure your tire size, then you can figure the speedo gears. You also have to know how many teeth are on your speedo drive gear. For T5's it's either 7 or 9 teeth, 700r4's are 15 or 17 teeth. All my combos have worked out perfect using it. http://www.5speedtransmissions.com/calculators.html

americanmuscle3

iTrader: (1)

i found one for a mustang t5, that wouldnt work or will it?

Pat Hall

iTrader: (31)

Not 100% sure if it would work or not. I know the input shafts are vastly different on the Ford T5's, but there's probably a real good chance that the output shaft diameter might be the same size on both GM and Ford T5's. A good business to contact with T5 questions is Hanlon Motorsports. They can probably tell you if it would work or not. But yeah, if you can find a 6 tooth drive gear that fits, then all you'd need to do is dig up a 21 tooth driven gear and you'd be all set. If your speedo is cable driven instead of electric, that makes it even easier to find the driven gears since the all plastic driven gears that fit the old Muncies and T10's fit the T5 mechanical speedo bullet too. The electronic style gears that fit on the metal drive shaft with the D-shaped hole are always harder to come by compared to the all plastic gears.

engineman

I'm restoring a 1989 z28 in the process of building a 383 i have 273 gears what do you suggest

mike_c

iTrader: (13)

Will a 4th gen T5 VSS driven gear work in a 3rd gen T5?

autotec101

just to update, I did find a use brown driven at a tranny shop, installed and speedo was still out, I ended using my original white driven and changed the the driver to a red. So for some reason all the data and calculators didnt mesh with my set up. But I got it now within 2 kms, so I am happy. I also still have the brown VSS driven gear If someone cant find it anywhere, Id take 20 canadian and that would include shipping within canada, US shipping probably 25 would cover most of the continent.

camaro1185

I just got done changing from 3.08 drive/driven gear combo in the trans to a 3.45 drive/driven gear. My problem is when putting shifter block back on, I set it up in N but buy the time the tailshaft becomes seated, the shifter block moves into the 4th gear position. Any ideas on what i can do to prevent the shift bar from moving?

Swt SS

I have a question, I have an '89 camaro t5 tranny from an z28 iroc. I don't know what the rear end gears were.. but the drive gear is RED, I am wondering what the teeth count is of the drive gear..

Pat Hall

iTrader: (31)

The red drive gear is usually a 9 tooth count. Kinda strange to have that drive gear in an Iroc, or Z/28 T5. It's commonly used when the rearend ratio is 3.08, which is the ratio that came in pretty much ALL the L03(305 TBI) powered RS Camaros with a manual trans. I've seen a few Irocs with 3.08's, but it's sorta uncommon. The more common drive gear is the blue, or purple colored 7 tooth one, which comes with 3.23 or numerically higher rearends.

backlash43

hello, i am in need of your brown 18 tooth gear if you still have it.
i will pay with paypal. my email is backlash43@yahoo.com
thanks,
don

86 irock z28

i got a t 5 um is thier any way i can beff it up like mack it any stronger im plaing to swap out my moders and like i k it put out to much tq for it to handel also the ingen i have in it nowe has just enuff to f with it um i dont wana go back to a\t and t56 are to exspincev
any idas no i dont wana go to a turbo 350 or any thing like that that will chew my gas up its my daly driver

JamesC

iTrader: (5)

I'm afraid my understanding of much of the above is limited, but it appears that you're off topic. Perhaps posting your question in the general forum would generate better results.

JamesC

Pat Hall

iTrader: (31)

Holy cow, I don't normally nitpick about another poster's grammar too much, but jeez, did you even finish elementary school?

camaro1185

Holy mother of god, put down the wrenches and open a book.

backlash43

i found a brown gear, it still reads slow. i went from a 3.42 to a 3.23. the 18 brown is closer than it was but is still about 8 mph off. i guess i will try to find a 17 tooth....if they made one. 1991 rs 3.1 5 speed 15 inch tires.

cubby-5056

Hello all. I have a 1991 z28. It has a t 5 I got from eBay in it. I just swapped rear ends this weekend with a 4.56 2000 trans am. There is a vss on the tranny. My speedo now reads 160km hour when I'm doing 100 km hour. I think that makes it like 45 miles out. Any idea if I can just change the gear on the vss itself and what gear it would be ? Where could I get it?

Pat Hall

iTrader: (31)

Hello cubby. I used an online speedo gear calculator and came up with a few combos. The first thing you need to figure out is how many teeth you have on the speedo drive gear that's on the output shaft of the trans. The 2 most common tooth counts are 7 and 9. 7 is usually a dark blue or purple color, 9 is usually red. When I did the calculations, I entered the standard 3rd gen Z/28 tire size(245/50/16). With a 9 tooth drive gear and 4.56 rearend gears, you'd need a 32 tooth driven gear, which I don't think even exists. With a 7 tooth drive gear, the driven needs to be 25. That might also be either non-existent or damn hard to locate. PATC Raptor corp. sells drive gears that fit the T5. You could check their site and see if they offer a 5 or 6 tooth drive gear. If so, that'd make it much easier to locate a driven gear that'll match up. With a 6 tooth, you'd need a 21 or 22 driven, 5 tooth would require an 18 tooth driven. Figure out what drive gear you have in your T5 and also let me know what your actual rear tire size is. If your rear tire isn't the standard 3rd gen size, that'll change the tooth count you're gonna need. This might be a tough problem to straighten out since the factory never offered 4.56 as a rearend gear, so that makes it hard to get the proper speedo driven gear. If you can't manage to get the right combo for your existing VSS, the other option would be to buy an adjustable VSS unit that fits the T5. I've seen them on PATC's site, but I'm not sure if any of them work with a T5. You'd have to look on their site or send them an email I guess. Hope this info at least points you in the right direction!

cubby-5056

Hey Pat thanks so much for the reply. Ya I think it's going to be a tough one. I'm going to check that website you suggested and see what they have. Also there is a GPS option for approx 250$ that I may try out to see if it's compatable. I'll post the results. Thanks again

Pat Hall

iTrader: (31)

Glad to be of help! Also, I forgot to mention, if you end up going with an aftermarket, adjustable VSS, make sure it has the correct PPM (pulses per minute) to be compatible with your computer. If I remember right, 3rd gen computers require 2000 PPM, whereas 4th gen and newer ones call for 4000 PPM.

vistageek92

iTrader: (2)

How close to perfect is running that 22 tooth with 4:10
s Kevin? First you said the 22 Tooth was for 3:77 then you said it was for 4:10 and the 21 was for 3:77.. just wondering if this is a perfectly accurate thing or if it just a "get in the 5mph range close"

Westech

Yeah I am in the same boat as most of us. I did a 3.08 to 3.73 swap in my 91 RS and have no idea what gears to get.
Do I get just a new driven gear or how does all this work with the VSS system.
Thank you for your help.

Pat Hall

iTrader: (31)

If I remember right, the 3.08 geared RS's with a T5 use the red 9 tooth speedo drive gear. That calls for a 27 tooth driven gear, which doesn't exist unfortunately. You'll need to install the blue/purple 7 tooth drive gear and get a 21 tooth driven gear. That's assuming you have stock tire size(215/60-15). If you have a different size tire, you can go to this site to figure what speedo gears. They have a really handy calculator. http://www.5speedtransmissions.com/calculators.html

Westech

Has anyone installed one of the VSS converters? I have looked at them before just never pulled on buying one.
The gears are not looking too good for finding them so I was thinking of just installing one of the converters.
http://www.summitracing.com/parts/slf-33002

I know its not the GM one... just showing what it is.

robmaxfli

My T5 has a RED drive gear but it only has 7 teeth on it (not 9). Everything I've read on here says that the RED gear has 9 teeth.
Am I missing something here?

Pat Hall

iTrader: (31)

Yeah, that is kinda strange. Usually the factory 7 tooth gear is either dark blue or a kinda purple color. Who knows, maybe whoever owned it before had to replace the drive gear at one point, and the replacement could've been red I guess. Crazier things have happened! Lol. Good thing you actually counted the teeth. The factory 9 tooth drive gear is red from what I've seen before, and that's the gear they got with the RS TBI 305 cars that had the 3.08 rearend gears.

chazman

iTrader: (4)

Okay guys, I need help. I've done the claculator but I'm not sure. I'm converting to a T5 trans and retaining mt 2.93 rear.

Do I need a 7 tooth drive gear with a 15.6 driven gear?

Pat Hall

iTrader: (31)

Hey Chazman. Assuming you have 245/50/16 tires, the calculator I used says you can run either a 7 tooth drive/16 tooth driven gear, or a 9 tooth drive/21 tooth driven. Given those 2 choices, it's probably easier to locate a 21 tooth driven gear vs. a 16 tooth one. The white, 21 tooth driven gear is pretty common. Here's the calculator I used if you need to enter a different tire size. http://www.5speedtransmissions.com/calculators.html

chazman

iTrader: (4)

Thanks Pat!

chazman

iTrader: (4)

What if the trans has a 6 drive/19 driven? I think i'd need about a 14 driven with the 6 drive. What would I need with a the 19 driven?

Pat Hall

iTrader: (31)

Yeah, a 6 tooth drive comes to a 14 driven. I don't think I've ever seen a 14 tooth driven gear available though. And the closest thing to a 19 tooth driven, would be an 8 tooth drive gear, and that comes to an 18.4 driven gear, so if you rounded that, you'd actually want to use an 18 tooth driven, not a 19 tooth. So yeah, don't use a 19 driven, an 18 is a better match if using an 8 tooth drive gear. I still think using a 9 tooth(red) drive gear would be your best bet because that would require a 21 tooth(white) driven, which is a pretty easy one to find. In fact, as far as availability goes, the 9/21 combo is pretty easy to come by.

chazman

iTrader: (4)

Okay, I actually have a 7 tooth drive. Anyone have a source for a 16 tooth driven?

Can this be made to work? http://compare.ebay.com/like/370507112045?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar

lefman

Hi there, hopefully this is an easy one for you experts!! I have a '92 firebird. It was a base 6cyl. My son and stepdad swapped it with a 355 and a 3.42 rear end. Tires are stock size and it has a 700R4. The speedo is way off (slow). I'm not a mechanic but seem to be in charge of figuring this one out! Anyone have any suggestions on which gearing I should be looking for? I've read alot of the posts but, damn, it's confusing! Thanks for any direction...Greg

Pat Hall

iTrader: (31)

Ok, not sure which tire size is YOUR stock tire size, so I figured it for the 2 most common ones. If you have 245/50/16's you'll need a 15 tooth drive gear on the output shaft of the trans and a 40 tooth driven gear. If your stock tire is 215/60/15 it'll be 15/41.

Pat Hall

iTrader: (31)

That speedo gear will work with stock Ford manual trannys and the Tremec TKO's, but there's no way it'll work in a T5. I checked a couple of places and couldn't find a 16 tooth driven gear. What size are your rear tires? There might be another combo that could work, such as using an 8 or 9 tooth drive gear on the output shaft of the trans.

lefman

Fantastic Pat! Thanks for looking that up for me! I'll hit that tranny site link and order those 2 parts. (15" stock tires BTW). Tx again! Greg

Pat Hall

iTrader: (31)

No problem, glad I could help! Btw, you'll need the #54 speedo gear housing on PATC's website to work with the 40 and 41 tooth gears, or you can carefully grind down the shaft of the speedo gear just enough to get it to slide into the plastic 34-39 tooth housing. I just did this to a 40 tooth driven gear on my car the other day and it worked out. Didn't want to shell out the cash for the aluminum gear housing! Here's the link to PATC's speedo gear page. http://www.transmissioncenter.net/sp...n_______va.htm Another way to make them work with the 34-39 housing would be to remove the rubber seal at the end of the housing, grab the right size drill bit and bore it out just a little, then put the seal back in the end. The reason the higher count gears need a different housing is the shaft of the gear is just a wee bit thicker in diameter than the 34-39 tooth gears.

lefman

Oh thats funny, I was just browsing that site! Well I hear you about the money, but I want to get all these parts right and take it to the local garage. I want it to work and I don't want them to bitch about the parts having to be modded or whatever.. So if I get all 3 parts, I should be golden. Great info and tx for helping me out! Greg

lefman

All 3 parts are on order--TX Pat!!

Pat Hall

iTrader: (31)

Did you make sure to order the o-ring for the housing too? For some reason it's not included with the gear housing, but they do sell it separately for $1.50. Btw, they have the cheapest price for that aluminum housing that I've seen anywhere. On Ebay and other sites, they want 80-90 bucks for the darn thing! Actually, if you did forget the o-ring, you can carefully take the one off your existing housing and it'll fit on the new one.

lefman

No, but I'll add it real quick--TX!

downsouthboy

Just found out that part #14090580 has been discontinued. Didn't check on the other pieces. But its possible they have been discontinued as well. Only place i can find that carries the whole sleeve assembly is a vintage auto supplier out of wisconsin. Will find out more later !!!

alloy

iTrader: (16)

I found this pic on the Pactrans web site. I see posts all the time asking how to count the teeth on a drive gear. This pic explains how to do it.

This isn't a T5 gear, but the idea is the same.

musclecar70sfan

iTrader: (1)

I noticed that somebody brushed up on the electric VSS driven gears for the T5 with no real answer... well I have part numbers for the 19 and 20 tooth gears right here after calling a dealership while looking for one. I need the 20 tooth however that was nowhere to be found, so a 19 tooth may suffice as well if I can find that (I have a 3.45 9 bolt)

20 tooth: 14090593
19 tooth: 14090592

Any leads on where to find these? I could find next to nothing online regarding the 20 tooth, however gmpartsdirect.com has the 19 tooth listed as a "special order" item. I sent them an email an hour ago asking if they can in fact get their hands on it because the dealerships can't, however I haven't gotten a reply yet.

alloy

iTrader: (16)

The T5 drive gears are now available. I have both in stock.


https://www.thirdgen.org/forums/engi...7-9-tooth.html

CrAlt

Hello,

I have a 1983 T/A with a 700r4 and mech speedo. 323's

I have a 1989 T5 out of a firebird that I want to swap in. had 308's

I have all the parts from the 89 but I just noticed my speedo will not work with the electronic T5.

Whats the best way of hooking up the stock mech speedo? I read somewhere that I need to get parts off a TH350?

Thank you
-chris