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Discussion Starter · #1 ·
I've done some searching here but can't seem to find an answer. I have an 01 330i with a steptronic. I'd like to help the acceleration and was hoping I could swap out the differential. After some research I found "inconclusive" evidence that a 3.64 ratio Z4 diff could fit my 330i.

Is this true? Has anyone done this swap and if so....

How many rpm's you pulling at say 70mph in top gear?
Was the swap a dramatic difference?
Where any other mods necessary to achieve the swap?
Any negatives?


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