While looking around my newly acquired e30 i noticed that someone had swapped a 3.91 diff into it. Any way to tell what it was originally from?
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318is with 3.91 LSD
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Assuming it's a US car, here's a few possibilities:
If it's a small case, it may have come from an m10 powered 318i e30.
If it's a medium case viscous LSD, then it's out of a manual 325ix e30.
If it's a medium case clutch LSD, then it came out of a e24 635 automatic car (possibly an e28?) and the cover has been swapped to an e30 version.
I hope this helps you get started!
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