Talk to Lloyd buttfoy; his father built the ZFs
When I was over the Pond, I talked to the founder of Safir
who told me the M1 versions of the ZF were better, as he had previously used them on some racing M1s. But Lloyd, who owns the tooling for the ZF 5 speed can tell you better.His business is in Orange CA right off Katella.
Fprd had to change the ZF gearbox in the Pantera for one that was quieter
after the original ownrs complained.
I have heard the Mangusta gearbox is closer to that used in the GT40; but I think on the GT40 it might have had a lighter weight case
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