rear differential trouble

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02-11-2007, 01:20 PM

g60vdub

Thread Starter

Join Date: Feb 2007

Posts: 2

rear differential trouble

I have a 01 a4 Quattro (113,000 miles)that is making a humming noise from the rear differential (loudest at 50 mph). Diagnostics so far: I put the car on a lift a spunthe back wheels, no noise was coming from the wheel bearings. I then spun the wheels as fast as I could and listened to the rear diff where I could hear a low clunking noise. I checked the fluid it was clean and only an ounce or two low. I am assuming that the bearings are going bad.

Questions: What commonly goes wrong in the rear diff? Where can I buy the bearings? What other parts should be replaced at the same time? What is the estimated cost of having this job done at a shop?

Thanks in advanceâ€¦

02-11-2007, 03:25 PM

david9999

4th Gear

Join Date: Jul 2004

Posts: 4,354

RE: rear differential trouble

Never heard of one going bad. I'd drain the oil and replace it with fresh synthetic anyway.

Sure it isn't your fuel pump making noise?

02-11-2007, 03:41 PM

g60vdub

Thread Starter

Join Date: Feb 2007

Posts: 2

RE: rear differential trouble

Sure it isn't your fuel pump making noise? >

I could hear the noise with the car off spinning the wheels on a lift. The sound was coming from the diff 99% sure.