I'm 80% certain the diff on my 97 M3 daily driver is shot. It is not driveable. I'm shopping for a replacement, but can't find one locally and am agonizing over shipping costs added to an expensive part that I can't say for certain will fix my problem. Locally there is one available from a 97 328i for only $50. I realize, of course that this is not a limited slip diff and that the ratio is taller. My question is, however, would it fit and function? If so, I could have the car back on the road tomorrow and for next to nothing. This would give me plenty of time to locate the correct part locally and the confidence to know that I was throwing 3 or 4 hundred in the right direction.