actually if you hold one side and cannot spin the other, it is an lsd. the Lock up on the e30 lsd is ~90 lbs. so you have to put 90 lbs of pressure to unlock it. atleast that is how my past 3 LSDs have worked. I dont think BMW is going to mistag anything, but anyway it could be rebuilt to an lsd.
FS: E30 M3 rear diff, Stebro Stainless M42 exhuast
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