LT1 Corvette TKX swap?
Thread Starter
Intermediate
Joined: Aug 2023
Posts: 36
Likes: 6
From: Wilmington, NC
LT1 Corvette TKX swap?
So I've been trying to get into the C4 corvette world for a hot minute and I'm finally getting into the position where I can get my hands on a C4. Unfortunately at least in my area pretty much all C4's are autos, especially the 93+ models with the LT1 which is what I'm looking to get my hands on and any manuals are well into the 13-16k price range which is inane to me. I've done some reading around here and other Corvette forums about manual swaps and I've seen that the T56 seems to be the go to swap for LT1 Vettes, although I've seen there have been a few instances of people swapping the more affordable TKX into earlier L98 models. Was curious if there are any instances of people doing the same on a LT1 model? I've seen a swap kit from Silver sport but it says its only good for the 84-88 model years. Any info on this would be greatly appreciated or other alternatives to the T56 that might be a little more affordable. Thanks 
Safety Car
Joined: Nov 2008
Posts: 3,717
Likes: 551
From: Seattle Washington
I would not consider this an easy swap. I would consider the time and money spent buying a ZF car well worth it. Expand your search area wait a little longer. In many areas of the country ZF cars don't sell for any more than Autos.
Drifting
Joined: Jun 2020
Posts: 1,696
Likes: 728
From: Stay dangerous my friends
Plenty of ZF S6-40 cars out there... and plenty of good used ZF S6-40's available also. Problem with the Auto is it's Dana 36 rear end, and you also have to get the clutch pedal, manual length driveshaft... problem with the T56 is that it's not as strong internally as the ZF (which was designed with the introduction of the ZR1)... and T56 is structurally not a good fit for the C-Beam.
The Silversport TKX kits are for the 84-88 4+3 cars as they try to create bolt in kits, with all the needed parts included, like the C beam adapter and yoke to fit the manual driveshaft. The bellhousing, clutch, driveshaft, slave and master can all be re-used. The kit will work on an auto car or a ZF car but there's more that needs to be done. The other TKX kits out there have a shifter location too far forward, and only Speedway makes a c-beam adapter outside of SS... or supposedly, they prototyped it and have promised it for a couple of years now. Speaking of Speedway, their 1986 C4 Corvette project:
https://www.speedwaymotors.com/the-t...corvette/31489
The Silversport TKX kits are for the 84-88 4+3 cars as they try to create bolt in kits, with all the needed parts included, like the C beam adapter and yoke to fit the manual driveshaft. The bellhousing, clutch, driveshaft, slave and master can all be re-used. The kit will work on an auto car or a ZF car but there's more that needs to be done. The other TKX kits out there have a shifter location too far forward, and only Speedway makes a c-beam adapter outside of SS... or supposedly, they prototyped it and have promised it for a couple of years now. Speaking of Speedway, their 1986 C4 Corvette project:
https://www.speedwaymotors.com/the-t...corvette/31489
