Im getting into Autocross racing, and i want to swap my automatic out for a 5 speed, since im alot better at racing stickshift..
I was wondering what a good 5 speed transmission was for the 5.7 tpi that is for the most part a factory tune, i cant use a modified transmission or it will step my car up from stock to street tuned, and i cant afford the mods for street tune right now. any suggestions? *i will beat this transmission to hell racing it so something thats pretty solid*

 

umm, 5 speeds didnt come with the 5.7 from the factory. and a wc t-5 would be your best bet i guess, they came with the 305s. but ive heard that they wont stand up to a lot of power, atleast thats what ive been recently told. im not sure, look around.

 

Stock 5 speeds are realy weak,even the WC t5 won't last long behind a 5.7. Would a tremec tranny be ok for your class?

 

Your only option for stock is a World Class T5, available behind 305 TPI's and 305 TBI's in 1988-1992 f-bodies.

It should be ok behind a mild 350 but aggressive shifting will kill it. Third gear is the weakest.

 

I emailed someone from the scca to find out what options i would have as far as the transmission goes... im hopeing they wont care about me putting something like a tremec tranny in.... but to be perfectly honest if they dont like the idea.. i might just lie about the tranny anyway.. i know the T5 would crumble... for autcross i throw shifts hard, i started autocross in a WRX STI, and you could abuse that transmission as hard as you wanted..
Im just hopeing that they arent to attentive to detail for the inspection.. i eventually plan to move to street tune or modified class anyway..

does anyone know what tranny was in the 4th gen Z28s? and would that fit up to my 5.7

 

t56 (6 speed and very strong in stock form) and yea it will fit with some some tweaks..