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Will somebody let me know if the Tremec T56 magnum transmission will fit in my 1966 Cutlass F-85?
I am replacing the original power train from bumper to bumper. I am replacing the original 330ci engine with a 350. In place of the original M-21 I would like to have the 6-speed Tremec.
I am thinking 9" Currie rearend with 3.73 gears.
Everything that I have looked at online states that the 6-speed will not fit in that chassis without tunnel modification. Some of the "kits" even come with sheet metal material for that purpose. There are versions of the 5-speed available which will fit without tunnel modification including the newer TKX model. That would be my choice.
In the days before conversion kits, I put a T56 in my 1970 Cutlass (1970 probably had a bit bigger tunnel than yours). I had to remove the tunnel back through the floor pan brace to give enough room. The T56 is a TALL transmission.
Construction and completed shots below...
Gary
The hardest part, psychologically was cutting up that rust-free floor.
My stick position ended up 3" farther back than that on the factory 4-speeds.
May 9th, 2022, 05:18 AM
