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I do know that 330d with M57 can swap a manual trans into a M57 335D. I'm told the 330D diff needs to be part of the swap. This is due to the final gear on the 335D auto is a deeper overdrive than that of the 330D manual top gear. The 330d diff makes up for this with a numerically lower ratio. Doing both in the swap keeps your RPMs down on the freeway.
You need to compare the diff ratio on your manual N57 to that of what I point to above.
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