323 355 or 373 gears??

69_340_GTS said

Don't you need to butcher the crossmember and/or floorboards to put that trannie in an A-Body?

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IF i did a GM trans, it would be 4l70E based, which is more like a 700R4 size. Now the 4L80E is HUGE. 1. its overkill for 500HP. 2. Yes, i think OP is going to have to do some major cutting.