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4+3 to 6 speed

 
Old 05-10-2019, 01:18 AM
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Logan Shoemaker
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Default 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?
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Old 05-10-2019, 01:48 AM
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65Z01
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SST makes a Tremec makes a 6-speed kit for C3, maybe they can give you a solid answer.
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Old 05-10-2019, 08:06 AM
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ChumpVette
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A lot of work.

Biggest part is reglassing the tunnel as the 4+3 shifter is mounted to the trans tunnel.
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Old 05-10-2019, 08:50 AM
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Originally Posted by 65Z01 View Post
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 ainít cheap😬
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Old 05-11-2019, 07:50 AM
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Originally Posted by ChumpVette View Post
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.
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Old 05-14-2019, 01:53 AM
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Logan Shoemaker
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Thank you guys!!
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