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Kristian,

See previous thread with photo's; there's a bit more to it than simply flipping the ring gear, but all parts available.

The ZF case is ribbed and stronger, plus you'd get the CV axle output shafts and the M1 has oil cooling if you retain the rear cover.

http://pantera.infopop.cc/eve/...0045562/m/4981072156

With your application and the fact you are using a dry sump, you could investigate retaining it in the current orientation and lowering the motor for an overall lower center of gravity?

Julian
The M-1 main gearcase is heavier and stronger due to the extra bracing, and the mainshaft & countershaft plus the bearings are all larger in OD. That's why we can't retrofit early gearing into the late box (or vice-versa) without machining. Never heard that the M-1 was weaker; here in the U.S, they are called 'super-ZF's. I think this is a Lloyd Butfoy question but probably not important unless maybe you are vintage racing.

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