Quote:
Originally Posted by GuidoK
Yes, X3 diffs might be a drop in replacement. e8x 1 series not.
The x3 was fitted with a 3.91 ratio
That said, you can only use the 3.91 from the manual 2.5i and 3.0in52. the automatics 3.91 have a 168 diff, not 188 according to the parts catalog.
Those differences are not in that specsheet but is crucial for fitment.
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Just in case, I hadn’t posted that pic suggesting those on there not e86/86 are compatible with one another. I just cropped the pic from the very long chart it is from the linked website and saved it from how it’s listed because I have an E82 too.