Rumble in the Rear

[Blue92]

Recently Ihave noticed when turning left under acceleration a rumble coming from the rear of the car. (92 Vert) I can also feel it in the seat. Also when you shift (automatic) into reverse I can feel the rumble while holding the brake on. Diff, universals, wheel bearing, trans was just serviced with new fluid and filter. Any thoughts on where to look first?

 

[Moonunit 451]

I had a similar problem when the wrong gear oil was put in my Diff. Got the right stuff in there (with the posi additive), problem solved

 

[Blue92]

I see where there is a filler plug on the side of the diff. How do you drain the gear oil from the rear?

 

[tlong]

I just got back from Mr. Goodwrench after diff oil change. They had defective additive after I suggested it. Labeled wrong. The rear end clutches were howling like a stray cat. That sounds like your situation.