The difference in a nutshell is...
The M1 came along a few years after the Pantera so by that time ZF had a chance to beef it up where it was weak. I would contact some M1 shop if there is such a thing and ask them or call Roy Butfoy (RBT transmissions, orange CA) the leading expert in ZFs. Also call Dave Adler at P.I. Motorsport who has ZFs on the shelf and may know the differance. He often sells Panteras with 450-550 hp. and drives one himself on the street (a car called "Whiplash")
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