Can you please expand on what models use these two ratios? Is it an e53 euro spec x5 diesel? Swapping the rear did is easy but finding a front dif that mates to the m57 is a bit challenging
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3.64 ratio diffs from the 00-03 4.4i. M57N manual has 3.23s and M57N auto has 3.91s. The 3.64s are easily acquired in the US and are an intermediate ratio between the two.
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