- - 4+3 to 6 speed
(https://www.corvetteforum.com/forums/c4-tech-performance/4272574-4-3-to-6-speed.html)
Logan Shoemaker
05-10-2019 01:18 AM
4+3 to 6 speed
Hey guys. So I haven't seen anyone ask this yet but I'm sure it's been done countless times and I just dint know. But what will it take for me to take my 4+3 and have a good ol 6 speed in my c4?
65Z01
05-10-2019 01:48 AM
SST makes a Tremec makes a 6-speed kit for C3, maybe they can give you a solid answer.
ChumpVette
05-10-2019 08:06 AM
A lot of work.
Biggest part is reglassing the tunnel as the 4+3 shifter is mounted to the trans tunnel.
slow_zo6
05-10-2019 08:50 AM
Originally Posted by 65Z01
(Post 1599376021)
SST makes a Tremec makes a 6-speed kit for C3, maybe they can give you a solid answer.
That they do but like the previous response-it def ain’t cheap😬
hcbph
05-11-2019 07:50 AM
Originally Posted by ChumpVette
(Post 1599376574)
Biggest part is reglassing the tunnel as the 4+3 shifter is mounted to the trans tunnel.
I can't speak to a 6 speed, but you may want to check with some of the vendors (assuming you're considering new) to see if they have a direct fit transmission. The reason I say this is my 86 had a Tremec 5 speed put in it before I purchased it. I did have a chance to get under it when I bought it looking for a transmission model. While looking for those transmission numbers, I don't remember seeing any modifications to the transmission tunnel. The shifter in mine looks to be right where the original 4+3 would have been located.
If on the other hand you're looking at a ZF 6 speed, I have no idea on that one.
