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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Im not sure im understanding how the final drive number is attained from the other numbers, based on the chart im looking at. Does the final drive ratio have an effect in all gears?