are there two different trans in zr-1's

[zr-1assassin]

guys, i just had a gm mechanic (there corvette guy) mechanic tell me there were two different transmissions put in the zr-1! i of-course told him he was crazy. am i wrong??? one was a t-10 and the other was a t-6 or something??? he said some where 6-speeds and the others were 5 speeds with overdrive! help me out on this if you have heard about this please

[DaveK]

I've only heard of one but I'm not a corvette historian. The T10 was the old 4speed in the pre-C4s I think and also formed the non-overdrive part of the Doug Nash 4+3 in the early C4s. No idea what a T6 is.

Sounds like their 'corvette guy' needs to go back to school

[Corvettes White]

Yes and no.

One family of ZF 6 speeds but two styles of gears inside, if I recall corectily.

George

[IowaZR-1]

The part # was changed on the ZR-1 transmission from 10186865 to 10255122 starting on VIN #800232 in the 1993 model year. All Zr-1's are 6-speeds and 5th and 6th are overdrives.

[blackjack]

there are two types of zf-6,apparently...the early ones(90-93) can handle more torque,as the late ones have different teeth angle to make them quieter,but a little less beefy
bj 91/1735

[Aurora40]

Originally Posted by zr-1assassin

he said some where 6-speeds and the others were 5 speeds with overdrive!

No, that never happened. There were earlier Corvettes that had a 4-speed with a 2-speed overdrive, but not by the time the ZR-1 was on the scene.

Originally Posted by Aurora40

No, that never happened. There were earlier Corvettes that had a 4-speed with a 2-speed overdrive, but not by the time the ZR-1 was on the scene.

4+3
4 speed with 3 gear OD.

[Aurora40]

Originally Posted by Jeffvette

4+3
4 speed with 3 gear OD.

Right, well the OD was a 2-speed overdrive, as in it had two ratios. It resulted in 3 extra overall gear ratios though (as it wasn't used on 1st gear).

[zr-1assassin]

thats what i was thinking!!!!!!! AURORA. this is all over me having the clutch replaced. he asked me wich trans i had and i was dumbfounded. for some reason i never have had much luck with the GM techs. and to top it all off he said just to put it in (i already purchased the clutch kit) would be $1240.00-JUST TO PUT IT IN! does someone know what this SHOULD cost to have the clutch installed. no flywheel-just ACDELCO clutch kit i have? thanks guys

[tomtom72]

I live in the NYC/Metro area & that's the price I was quoted to do the labor, more or less. The dealer that quoted me was below a $100 @ hr on the labor. If I remember right the total job, parts + labor was right at $1400 with the sales tax.


Tom

On the trans issue, I think the early Z's had black tag (made in Germany) and the later Z's were blue tag (made in USA). The gears in 1 thru 4 on the blue tag ones had different cut angle for less whine. I also believe the inputshaft collar has a different diameter so the T/O is different P/N on the blue tag trans but that may not apply to the Z, just the other 6spd C4's.