Guys,
I never said the M1 ZF wouldn't work, indeed, I said that had been successfully used. But facts is facts, and I am sorry Ross, argue all you want, the two boxes ARE different and the input shaft diameter is one of the differences. Just because the part of it that you could see looked the same, IT IS NOT.
I think that someone who is researching transaxles (or any part or component) should be told everything, good, bad or indifferent about the parts he is researching. (What I have pointed out about the M1 ZF probably falls in the latter category in most cases; the Audi transaxles also work, as do Renaults, but I'd use an M1 before either of those.) Better that, than down the road somewhere having him say, "I wonder why those guys on GT40s.com didn't tell me about that?"
Regards,
Lynn