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iTrader: (15)

im planning a 5 speed swap this winter for my 92 and have had almost no luck finding a 3rd gen t5 locally.

However, im finding a lot of the early 4th gen t5's. Will they work? the 3.4 is the same block design as the 3.1 i have.

Only difference i found searching is the 4th gen trans has a 14 spline input where the 3rd gne has a 10 spline? is that the only difference?

do the 4th gen ones use a hydraulic TO bearing or a fork?

what about the speed sensor and drive/driven gears are they the same? will the gears swap over and are the PPM for the sender the same between the years?

I assume i need a 5 speed PROM for the computer?

-Phil

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iTrader: (15)

nothing?

Maverick H1L

iTrader: (8)

As long as you can get the clutch to match the trans (which won't be too hard with a 3.4), the input spline count doesn't matter, but I'm pretty sure it's not a 10-spline input shaft (I'll need to go and count mine). AFAIK, there was no difference in the T5 except for the differences between non- and world class (bearings and blocking ring materials) and the input shaft WAS different between the 60* and the 90* V6 and the V8 transmissions.

Throwout bearing depends on the bellhousing. I'm going to assume that the 4th gen uses the same bell ours do to save on part development. I'll have to look when I get back to the J/Y. It should be a hydraulically-operated fork and not the hydraulic bearing the FWD guys use.

The VSS gears DO NOT swap. The 700R4 driven gear is about twice the size of the T5 gear. If you're lucky, the gears in the trans will be right (white driven, purple drive). If the driven gear is wrong, you can look around for ones from a TH350, as they are the same size. If you need the drive gear, good luck finding one. I got one of the last ones GM had, didn't need it, and sold it a couple of months ago to a guy on here because he couldn't find any. The VSS should be the same, but double check. There were 2 different style sensors, pre-90 and post-90. I believe the post-90 sensors put out a different PPM, but I never got a code 24 with my pre-90 sensor and the 91 ECM (even though my speedo didn't work with the ECM output and I got stuck using my factory buffer tied into the ECM wiring).

No, the manual MEMCAL is not necessary, and it will be pretty hard to find. If you can find a 93 F-body, there will be one in the PCM. 94 and 95 cars don't have a MEMCAL, so you're out of luck. I've been told that the latest calibration for a manual 3.1 is a BAWX... Those are hard to find as they were one year only.

hotrodln

I have a neighbor that just removed the t-5 from their 86. it's from a v-6 car....we are changing it over to a v-8...i'm sure they would be interested in selling it if you are interested. pm me.

Pillsbry10

iTrader: (1)

the splines for the clutch are different on the 4th gen. you would have to use a 4th gen clutch kit.

ttypecamaro

iTrader: (2)

I pulled the entire setup (t5 trans, bell housing, dust cover, clutch fork, throwout bearing, clutch disk, pressure plate, flywheel, hydraulics assembly, shifter, shift ****, torque arm bracket, pedal assembly with switches, and all the bolts) from a 3.4L 94 camaro. I was able to bolt it all into an 88 firebird after buying and installing a pilot bushing, drilling holes in the firewall for the master cylinder, and cutting out the tunnel for the shifter. For some reason that I can't remember, I used a 92 camaro crossmember and transmission mount I had laying around. I found an 88 firebird manual shift console, but the 94 shifter would just barely hit the console in 2nd and 4th gear. I was gonna heat up the shift rod and bend it forward a half inch, but I found a shifter from an 84 firebird and that one didn't hit. I don't remember if I had to get a new starter, but I probably did since I'm thinking about it.

The 4th gen v6 has a different transmission case and bell housing from a 3rd gen, so they can NOT be mixed and matched. Also, the clutch disk and input shaft on a 3rd gen have like 16 splines and the 4th gen have 26 splines.

The speedometer reads 7% fast untill I can track down the right speedo gears or swap the rear gears. The donor car had 3.23's and the firebird has 3.42's. I have a 3.23 posi disk rear in a smashed up car waiting.

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iTrader: (15)

thats good to know guys, thanks!

OdieTurbo

iTrader: (1)

Just found this in the search! What driveshaft did you have to use?

ttypecamaro

iTrader: (2)

You have to use the 3rd gen driveshaft because the 4th gen has a 2-piece shaft with a center support.

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iTrader: (15)

ok, so it seems i have located a trans setup. so back to the prom. I dont have a t5 prom, and i cant find the recommended BWAX prom. Can the auto be used? i read that it may cause some idle issues? Can the auto prom be tuned to work properly with the t5?

anybody know where to find the speedo drive/driven gears?

hotrodln

I used an 'auto" prom in my 84 TA with a 5 speed- it ran perfectly fine- but it set the "service enginee soon light all the time" when i scanned for codes , they had nothing to do with the transmission......if you've got it try it.....

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iTrader: (15)

ok. car has to go through inspection, so i cant have SES lights.

Maverick H1L

iTrader: (8)

I don't know why people always say you'll set a code with a manual run by an auto PROM/MEMCAL... They don't set a code for not having an auto trans. Only thing you may run into is a code for the VSS.

Speedo drive gears are a PITA to find (7 tooth, usually)... Look for gears for a TH-350. Pull the VSS out of the trans and make sure it's already got the purple drive gear on the output shaft (not on the VSS, the trans output shaft).

58mark

iTrader: (3)

Hey ttype

If the bell housing and case is different on a 4th gen, how did you get the 4th gen tranny to mate up with the engine in your 88? Or is the bolt pattern the same where it meets up with the engine, and different where the bell housing meets the tranny?

Are you saying that a 3.4 tranny will work fine, but make sure if I buy one, I have to get the 4th gen bell housing with it?

ttypecamaro

iTrader: (2)

You are correct on both.

drdave88

iTrader: (3)

FYI, the V6 WCT5 has a 14 spline input shaft, not 16.