I am currently doing a TH400 into a '64 GP. Your block must be drilled and tapped to accept the newer type starter, if not then you must use an adapter. There are adapters available, call if you need help 408-629-4948. You must also use the flexplate for the TH400 and of course the yolk for the TH400. There is a minor modification to the rear crossmember but its no problem. You will also have to sort out the type shifter and the length of the drive shaft. It may seem like alot to do but its worth it as the Roto- trans is really junk even when its working as intended.
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