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If you want to continue using the 4Matic the unfortunate answer is None. Only the 300TE 4Matic came with the 3.29:1 ratio. That is what is in the front, so if you change the rear you'll probably get some errors. I'm actually not sure how the computer would handle that.
That being said, if I was hard pressed to use something I would use a non-4Matic TE rear-end with a 3.28:1 ratio.
The 4Matic sedans have a 3.07:1.
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