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All manuals use the large diff. Pre-07 autos (only available in 335i's afaik) also use the large diff. Post-07 autos all use the small diff (inc. all 135i's). DCT and 335d all use the large diff.
Manual final drives are all 3.08. Auto final drives are all 3.46. DCT is 2.56, and 335d is 2.81
Yes, we have brand new 2.56, 2.81 and 3.08 final drives, so is a true bolted setup (no need for machining etc now on the welded diffs), and can be used with any LSD, not just the MFactory
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