Quote:
Originally Posted by ZarathustraDC
Did all 128’s in the US come with the same final drive ratio?
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I believe all manual 128i in the US come with 3.23.
US market Automatic 128i and most (all?) RWD 2007+ E90/E92 328i came with 3.73.
In my research it seems the automatic 128i diff may have something different about it (compared to the 128i manual rear diff), and everyone seems to use 2007+ 328i units... not sure if the sizing or flanges are different but that's what RealOEM lead me to believe.
You can also frankenstein a 3.91 ratio from an X-Drive E9X car but that requires swapping the driveshaft input flange and isn't quite as straightforward.
So, I personally just ordered a 3.73 auto RWD diff from a 2009 E92 328i and will be using that for my LSD install.