Originally Posted by
GKR_17
You don't if you want to be legal.
I don't know much about the E36 diffs (but ask me about E30 diffs ...), but I would think that they would be the same diff case as each other, so it should be a legal swap.
You probably just need to swap the output flanges between the two diffs. They just pop out. Take a long screwdriver, position it between the output flange and the case, and give it a little pop. Just swap the 318 flanges for the M3 flanges.
Josh Sirota
ITR '99 BMW Z3 Coupe
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