Just curious if anyone is running the 3.85 gears from a e90 manual M3. I plan on swapping to them when I pull the rear end out for subframe reinforcement.
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Last edited by jpiazzam3; 05-20-2023, 07:26 PM. -
Yes, I am running that setup since 2 years when I had the diff rebuild. No noticeable difference to the 3.91, but cheaper to source.
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I've found a 3.91 is great at nothing, ok at everything. It does provide a bump in acceleration, or at least feels like it. Also causes extra shifts at all the wrong times, right before a braking zone.
I think a 3.85 will be a little better for track use. I'm going back to the 3.73 I had at some point. Just not excited about swapping the R&P again.Comment
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