Not sure what your asking Greg.

Are you asking what it takes to use a 4 cylinder T5 behind a V8? Or switching to a V8 T5 behind a V8? Either way there shouldnt be any problems. As long as the bell housing matches the input shaft for the tranny it should be fine. Gear ratio wont be off by that much. I'm not 100% sure but I think the V8 T5 has a .67 OD ratio and the 4 cylinder used a .84. Could be GM version of the T5 I'm thinking of.

Hurst