68 427 Coupe Trans question
Thread Starter
Instructor
Joined: May 2002
Posts: 216
Likes: 1
From: Savannah GA
68 427 Coupe Trans question
I'm considering updating my 4 speed manual transmission to a 6-speed? This may be a stupid question, but will a T56 6 speed out of a 1990 Corvette bolt up to my 68 c3 427?
If not what 6speed trans do you recommend?
Thanks
If not what 6speed trans do you recommend?
Thanks
Racer
Joined: Mar 2013
Posts: 423
Likes: 25
From: Boca Raton Florida
I cannot remember if the 90 Corvette uses the Torgue tube and has the trans mounted at the rear or not. If so it will be much more expensive to convert then to get one that is mounted at the rear of the engine like in a Camaro. Also some of the years had lower HP ratings…I think the 94-97 are the better ones. Do a search on the internet and read up on them to confirm. Research is your friend 
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
Burning Brakes
Joined: Aug 2002
Posts: 1,190
Likes: 56
From: Milan Indiana
trans
A good source to ask that question would be Rodney at RPM Transmissions in New Castle Indiana.Acknowledged expert at this stuff. He'll be happy to help you out with advice. Good luck
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
As pointed out, the 90 C4 had a front mounted ZF, not a very popular trans. Any corvettes with a T56 will be a rear transaxle. You'll want to look into an f body LT-1 T56. Do not try to use the later LS1 T56.
You might be better off with a Tremec 5 speed from one of the aftermarket suppliers. A lot will depend on your rear end ratio and how you use the car.
You might be better off with a Tremec 5 speed from one of the aftermarket suppliers. A lot will depend on your rear end ratio and how you use the car.
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Verdad Gallardo
GM Cert Corvette Tech
Joined: Apr 2008
Posts: 2,559
Likes: 585
From: Anaheim Hills California
As pointed out, the 90 C4 had a front mounted ZF, not a very popular trans. Any corvettes with a T56 will be a rear transaxle. You'll want to look into an f body LT-1 T56. Do not try to use the later LS1 T56.
You might be better off with a Tremec 5 speed from one of the aftermarket suppliers. A lot will depend on your rear end ratio and how you use the car.
You might be better off with a Tremec 5 speed from one of the aftermarket suppliers. A lot will depend on your rear end ratio and how you use the car.
