New 5 speed from Tremec TKX

autoxcuda said

Thank you.

At that point how much more work is it to fix an off the shelf T56 you have the possibility of finding used?

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Used T56's can be had for less than half the price of a new Tremec 6 speed.
I don't know about others, but a Challenger trans has a flanged output shaft so an adaptor needs to be added for a splined slip joint. ($300) Lots of wrecked low mileage Challengers out there so no rebuild required.