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M46 vs M47

~105lbs for an iron M46 with bell housing and OD, no shifter/clutch fork. ~80lbs for an aluminum M47 in the same condition.
Funny, in my memory they seemed to be lot heavier than that when under the car.

Not looking forward to finding out.
Are we talking about iron cased M46 vs aluminium M47?

Edit: yes,
I've got an aluminium M46, but that's normal vor Europe I think, or do you have the aluminium M46 in US as well? I don't know..