Whining from rear of car?

[awdtalon4451]

I'm getting a whine from somewhere in the rear of the car during acceleration. I recently changed the rear diff fluid to Mobile1 75-90 full synthetic and i noticed it shortly after. I thought it might have leaked, so i dropped the plug and refilled it again. Its still whining though. Any ideas on what else to check? Wheel bearings maybe?

 

[Cdc1221]

Good possibility and all you need is a jack to check them

 

[BWtsi]

For the wheel bearings you jack up the car and see if you can get any play out of the wheels by pushing on them side to side top to bottom, if you get play you need new wheel bearings.

 

[dsmspick]

You say it is on acceleration, does it ever go away or get worse at certain speeds?

 

[yhype]

If the noise is during acceleration only, the noise is most likely coming from the rear differential. Wheel bearings can make noise without them having play in them.

 

[awdtalon4451]

You say it is on acceleration, does it ever go away or get worse at certain speeds?

Yes it goes away as i slow down or let off the throttle. It really stands out when I'm on the hwy doing 70-85mph.

 

[SY1100]

Try changing to a different fluid, if that doesnt help you may need to crak open the diff and see if it has broken loose..

 

[awdtalon4451]

Try changing to a different fluid, if that doesnt help you may need to crak open the diff and see if it has broken loose..

I did, i went back to traditional gear lube with no change. Maybe i portrayed it to be louder than it is. It sounds similar to the wally 255 but louder. I doubt it broke loose but something is def whinging.

 

[BWtsi]

If the noise is during acceleration only, the noise is most likely coming from the rear differential. Wheel bearings can make noise without them having play in them.

true say, but i havent came across a bad WB without play.

 

[goalie6263]

That's most likely the dif. My Chevelle did the same thing when we didn't break in new gears. Sounded like the fuel pump but louder

 

[awdtalon4451]

Check the carrier bearings in the drive shaft

Good point sir! Can you visually check them or is it something you take out and check for play?

true say, but i havent came across a bad WB without play.

A bad wheel bearing would be making noise all the time though and not just under throttle correct?

 

[Passnu2]

I think its your drive shaft and not the diff. Just ironic that it happened at the same time. Its also possible its your trans.

I recently helped a local S2000 owner with the same noise as your describing and he thought it was his trans so we pulled it out and replaced it with a newer/less mileage and the issue remained. You have to be very careful but after playing around and digging we had to jack up his car and secure it and get under the car while it was in motion to source it and sure enough the drive shaft went. It was the last thing we thought the noise sounded like it was coming from. I would highly suggest getting your car on a lift if possible. Hopefully this helps out.

 

[awdtalon4451]

Phones been broke but figured I'd update this. Ended up being my transfer case low on fluid. As much as I swore up and down it was from the rear of car. Didn't realize it till I jacked it up and drove. Weird how sound travels.