blackout

Yes, I have used the search function.

I am trying to diagnose and repair a rear end grind/groaning noise from my 8.8 rear. The noise only happens while turning. I had my girlfriend drive the car and while I was in the hatch, and it was really hard to diagnose. I also had her do some turning while I followed next to the wheels and it seems as if the noise is coming from around the hub.

I have done the following:

-Added friction modifier.

-Spun one wheel and the other spun with it. This leads me to believe the clutch packs are either okay, or not completely gone.

-Checked the axle bearings. No side-to-side or up-and-down movement.

-Pulled the differential cover. The ring and pinion gears look good. The spider gears have wear, but not enough to raise any red flags.

-Pulled the axles. Visually checked the axle bearings, but they looked great.

-Checked the drum brakes and visually everything looked fine.

-Checked the suspension for any signs of rubbing.

The gear oil was mucky, but I doubt the new fluid I have is going to solve the problem. I am going to replace the axle bearings and seals for reassurance.

I was thinking it was the clutch packs, but there are no symptoms of any issues with it beside the grind/groaning.

Everything is completely silent when I'm driving in a straight line at all speeds.

mjr46

what year car is this??

blackout

1991.

parrfive

If the quad shocks are still on there look at them to see if there is any rub marks. Also pull the rear wheels and look under the well for any rub marks. If not is most likely a bearing.

blackout

I already checked all of those things including the bearings, which are now replaced.

Anyways, I got the clutch packs out. The friction plates (left) seem to be in great shape, while the steel reactor plates (right) only have normal wear. The other friction plates and reactor plates looked identical.

Here is a picture:



Any input?

blackout

Any input?

blackout

The car is fixed. I believe it was the limited slip. I soaked the clutch packs in friction modifier for about an hour and changed the direction of the two inner clutches on each side. I put new axle bearings and seals, but don't think that was my problem.