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How can you tell what diff you have.
One of the upgrades listed on my car when I purchased it was that it came with a Dinan 4.10 differential. Is there a way to test out if that is indeed installed without opening it? The person that sold the car showed a picture of the receipt for the differential as proof but seeing as he also owned an E46 M3 I have always questioned which car it was actually installed in. I appreciate any help on this one.
thanks,
E
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