Hey all. I am new to the e60 but own an e38 and e39.

Anyway suddenly started to have a rumbling noise in the rear and gets louder to the point you can hear over the radio! Local shop looked and checked with a stethoscope and says there is a lot of noise in the diff. By searching it looks like the pinion bearing is suspect even in low mileage cars. Mine has 96k miles.

Question, where would you get this rebuilt? I am afraid to get a used one and risk having the issue again.

Thanks for any input.