1996 Audi A4 Quattro has a noisy rear differential
The car makes a loud humming sound from the rear. It seems loud at all speeds but even louder at around 45. But it's actually loud all the time. Had rear bearings replaced 30K ago and tires are relatively new. At driving speed if I take it out of gear the noise is still there, it doesn't change.
Re: 1996 Audi A4 Quattro has a noisy rear differential
It's the wheel bearing. Guaranteed. Just replaced mine. Go to Audiworld tech articles for step by step instructions on how to test the wheel bearings. They must have been put in wrong last time or they just went out again.
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Check your differential (rear-end) to see what the fluid level is?? If you are low on fluid then the bearing is wearing because of lack of oil. GET IT FIXED IMMEDIATELY BECAUSE YOU CAN LOSE A WHEEL IF THE BEARING GOES COMPLETELY.
HI,IT SOUNDS TO ME LIKE THE TORSION DIFFERENTIAL ON THE GEARBOX IS CAUSING THIS,PLEASE TRY THIS,DRIVE THE VEHICLE TO A OPEN AREA,YOU MUST PUT IT IN 2ND GEAR AND DRIVE IN A CIRCLE ONE WAY ABOUT 10-15 TIMES,AND THE SAME THING CHANGING DIRECTION,THE REASON I SAY THIS IS TO LOOSEN UP THE TORSION GEARS,PLEASE LET ME KNOW,ANDY.
this is your rear differential making noise. I would have it serviced and make sure fluid is clean. these are known for noisy diffs will need to be rebuilt. depending on how loud it can run a long time like this
Your carrier bearings and possibly the pinion bearings are the source if the noise is a low pitched grumble or gravelly noise that starts just about 20 mph and up. If it is louder when quickly changing lanes to the left, it is probably the right wheel bearing, and if it is louder when changing lanes to the right, it is the left wheel bearing. If it is a whine that is really annoying at 45-65 mph, your ring and pinion are probably worn beyond their design specification limit. If your U-joints are OK, but you can hear a loud clunk from the rear when you get on and off the throttle, you definitely have play in your ring and pinion. Have the cover removed and you can sheck this easily. I have worked on several Jeep Grand Cherokee differentials, and the ring an pinion has needed replacing on them all. A few had bad bearings, too. You should probably replace the bearings and the ring and pinion, because the labor is nearly the same and the parts are just a bit more. If you look through the forums on the www you will find many people that replaced the bearings to fix the grumble, only to finish the job and find out they also have the whine.
Can you give some more information about this? Is it only when your speed is up at highway speed levels, or do you hear it at lower speeds too? Does it ever get louder or quieter under any driving conditions or maneuvers? The reason I ask is that it could actually be a rear wheel bearing (they're known to go bad on this generation of Audis - heck, I just changed one on my A4 last week and now that it's quiet, I can hear the other rear bearing starting to go). If you can give some more info on this problem, we can try to narrow it down.