t56 transmission swap
Pro
Joined: Nov 2014
Posts: 728
Likes: 346
From: Smyrna, TN
I don't have an answer for you but perhaps this thread may shed some light on the subject...
https://www.corvetteforum.com/forums...-corvette.html
https://www.corvetteforum.com/forums...-corvette.html
Safety Car
Joined: Dec 2012
Posts: 3,974
Likes: 673
yes
Fits very well you just need to make a removable trans crossmember call modern drive line or silver sport transmissions and I used all the stock clutch linkage and used a quick time bell housing .
Thread Starter
Heel & Toe
Joined: Oct 2023
Posts: 20
Likes: 2
From: SOUTHWEST INDIANA
Thanks Rat, does the original drive shaft work and did it require cutting the hole bigger in the tunnel?
Last edited by idigplanes; Nov 22, 2023 at 12:10 PM. Reason: Misspelled
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
The tunnel needs to be opened in a different place for the T56 shifter. The drive shaft of course needs toi be shortened.
The T56 I used has a adapter plate that rotates the tranny slightly in order to get the shifter to a reasonable position.
Bellhousing and cluth stayed original.
Rgds.
The tunnel needs to be opened in a different place for the T56 shifter. The drive shaft of course needs toi be shortened.
The T56 I used has a adapter plate that rotates the tranny slightly in order to get the shifter to a reasonable position.
Bellhousing and cluth stayed original.
Rgds.
Thread Starter
Heel & Toe
Joined: Oct 2023
Posts: 20
Likes: 2
From: SOUTHWEST INDIANA
Thanks, I have a 68 I’m putting together. I acquired a 69 parts car that had a 427 with a t56 behind it. It doesn’t appear to have been run but it was in there. I’m confused by the need for a new cross member. Not sure about the shifter location either. I’m trying to figure out how to get this in my 68. Also did your speedo hook up work out?
Last edited by idigplanes; Nov 22, 2023 at 08:18 PM.
Safety Car
Joined: Dec 2012
Posts: 3,974
Likes: 673
yes
Thanks, I have a 68 I’m putting together. I acquired a 69 parts car that had a 427 with a t56 behind it. It doesn’t appear to have been run but it was in there. I’m confused by the need for a new cross member. Not sure about the shifter location either. I’m trying to figure out how to get this in my 68. Also did your speedo hook up work out?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Jan 2003
Posts: 961
Likes: 275
From: Frederick MD
Thanks, I have a 68 I’m putting together. I acquired a 69 parts car that had a 427 with a t56 behind it. It doesn’t appear to have been run but it was in there. I’m confused by the need for a new cross member. Not sure about the shifter location either. I’m trying to figure out how to get this in my 68. Also did your speedo hook up work out?
Here is the kit to to modify your OE crossmember. Link. Take it one step further and modify the center section to move the transmission back however far it needs to be moved.
Edit they also make kits for T56 transmission crossmember swaps.
Last edited by kossuth; Nov 23, 2023 at 11:31 AM.
Burning Brakes
Joined: Feb 2008
Posts: 769
Likes: 343
From: Mooresville NC
Here is another link to another C3 install. LINK
I believe most of the larger concerns have been addressed. It is well worth the effort in my opinion - probably one of the best C3 mods out there in terms of drivability and finding the perfect gearing combination for both efficiency and acceleration. I run a 3.70 rear end and with the .6 ish 6th gear I can still cruise at 75 mph on the highway at a little over 2000 RPM.
I believe most of the larger concerns have been addressed. It is well worth the effort in my opinion - probably one of the best C3 mods out there in terms of drivability and finding the perfect gearing combination for both efficiency and acceleration. I run a 3.70 rear end and with the .6 ish 6th gear I can still cruise at 75 mph on the highway at a little over 2000 RPM.
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
I cut the crossmember out and installed a automatic removable crossmember a few inches further aft.
I didn't want to cut the crossmember and install a removable piece in it or install a aftermarket crossmember as this is very visible to the governmental biyearly car inspection and they don't like someone cutting the chassis. The way I did it, it appears original.
My T56 is a strenghtened up Viper unit with a 0.50 6th gear. I originally had a 3.70 rear end , but found that the required speed was too high to use the 6th gear often enough, so I installed a 4.11 rear end.
I realy would prefer the 0.6 6th gear, but now need to live with this one.
In 1st gear, at idle, I can step out of the car and walk beside it. Hardly need to slip the clutch anymore for slow driving.
Brgds
I cut the crossmember out and installed a automatic removable crossmember a few inches further aft.
I didn't want to cut the crossmember and install a removable piece in it or install a aftermarket crossmember as this is very visible to the governmental biyearly car inspection and they don't like someone cutting the chassis. The way I did it, it appears original.
My T56 is a strenghtened up Viper unit with a 0.50 6th gear. I originally had a 3.70 rear end , but found that the required speed was too high to use the 6th gear often enough, so I installed a 4.11 rear end.
I realy would prefer the 0.6 6th gear, but now need to live with this one.
In 1st gear, at idle, I can step out of the car and walk beside it. Hardly need to slip the clutch anymore for slow driving.
Brgds