Noisy diff maybe not sure

[Dusty]

I have a '96 ti with the same symtoms. A high pitch sound or whining coming from underneath. The sound does not change with speed. Some people think (LOL) its a turbo/supercharger kicking in. (I wish!) I was thinking of having my differential drained a flushed, if there is such a term, also the transmission, but would like to know what the problem is.

[BeardoMcWeirdo]

Just a heads up to everybody who has read this thread I've come to find out that this sound that everybody is talking about is probably related to the differential Output bearing... This part usually goes for around $50... Many people replace the entire diff which isn't the cause.. From what I've read some people have gone 50,000 or so miles on it with no problem.. Hope this helps...

[stormos]

i'll remember that when my new one goes again

[bmwkru]

Originally Posted by BeardoMcWeirdo

Just a heads up to everybody who has read this thread I've come to find out that this sound that everybody is talking about is probably related to the differential Output bearing... This part usually goes for around $50... Many people replace the entire diff which isn't the cause.. From what I've read some people have gone 50,000 or so miles on it with no problem.. Hope this helps...

Has anyone verified this? I recently bought a 96 tia and have the same problem. The odd thing is that it the noise decreases when you let off the accelerator (it does not decrease very often ).

I really want to get if fixed but their are not very many people in my area that work on BMW's so I need to tell them what to replace or look for.

[jkilla71]

Originally Posted by hisbikes

I recently got my wife a 95 318Ti auto. There is a high pitched sound coming from the rear. Becomes noticable from about 50kph onwards but does'nt seem to get louder with speed increase or going round corners. The sound is remenecent to a Cicada (an insect here in New zealand that makes a high pitched noise on hot summer days). It's not overbearing but noticeable. (Can be clearly heard with the window open and passing other cars or when driving close to sidewalks. Has anybody experienced this?

I have a 95 Auto and it sat in the garage for a year or two without anyone driving it (For some reason I liked driving the A6 I had at the time). After coming to my senses I put it back on the road at 89K. The rear end under acceleration sounded like a jeep on the highway with big tires. I took the car to Jiffy lube and it still made the sound after that but the noise has gone away since I have been using the car everyday. I can't remember when, but I do live in south Florida now and the car doesn't see those cold PA mornings anymore so that could be a variable too. The car has 155k on it now and the noise has not come back.