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02-27-2018, 10:34 AM | #1 |
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135i N55 DCT - Possible to swap in an M3 DCT differential?
Hello,
I know this topic has been covered a lot for 135i/335i but with MT and some AT but I haven't found any clear answer about DCT with the 2.56 FD. I read a lot about people who have done it (here for example) and I know I'd need a custom-made driveshaft, axle shafts as well as the differential from a DCT M3 itself. I can get those easily and for a good price. I understand the M3 DCT differential has a FD of 3.15 which line-up pretty well with the x35i MT FD of 3.08, but would it work with my 2.56 FD or would it have any issues shifting at the right RPMs? Or any other issues whatsoever? Asking because this thread mention shfiting issues with a 3.08 diff in a N55 DCT. I understand my top speed would be lower with a 3.15 ratio as well, but that's fine. Thank you! |
02-28-2018, 06:18 PM | #3 |
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03-02-2018, 09:18 PM | #5 |
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Not sure about the physical compatibility of the differential, but the issue with swapping a different gear ratio differential in the DCT is that you will get errors from the DCT control unit seeing different speeds from what it is expecting. Someone tried it on one of the forums and ended up swapping back due to the unhappy DCT.
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diff, diff swap, differential, m3 dct, n55 135i dct |
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