Q: Rear differential problem

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I'm hearing a noise and it sounds like it's coming from the rear differential. My friend and I replaced the pinion seal because it was leaking and It never stopped the noise. I keep reading stuff that says it might be the pinion gear and how major is that problem?

My car has 130000 miles.
My car has an automatic transmission.

The reason the pinion seal went bad is due to the pinion bearing is bad and letting the pinion shaft move up and down. You may need to replace the pinion and carrier bearings in the rear end.

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