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      11-28-2018, 06:15 PM   #5
135iTime
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Drives: 135i, '12 X5 35D
Join Date: May 2017
Location: Midwest

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I would assume you should be fine if you swapped both the front and rear differential. If those ratios are the same the rest shouldn't matter. This is fairly interesting to me as well since I do a lot of freeway driving and it looks like used diffs are fairly cheap.
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