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T5 mount pad to main shaft centerline dimension?

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Old 06-22-2023, 08:41 AM
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Car: 1990 Pontiac Firebird Formula
Engine: L31 350 TPI
Transmission: Tremec TKX
Axle/Gears: 3.23 Posi
T5 mount pad to main shaft centerline dimension?

It appears that the TKX and T5 mount pad to main shaft centerline is significantly different, but I'm having a hard time finding the third gen T5 dimension. Hawk's includes the T5 torque arm relocation crossmember in their TKX conversion kit and I'm thinking it locates the TKX poorly. I initially measured a -4 degree trans/engine angle and 0 degree pinion angle (with the torque arm at the upper-most adjustment). I've used a taller transmission mount to reduce this to -3 degrees, but I feel like there's now too much flex in the mount under heavy acceleration. My belief is that the crossmember should locate the mount higher, but I would like to verify the T5 dimension before altering anything.

Last edited by rt66er; 06-24-2023 at 06:51 AM.
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