After I replaced my axle and torque rod bushings with poly., I noticed a slight
rear-end howl when accelerating between 65-75 mph. I replaced the
axle fluid with non-synthetic 80W90 GL-5 oil while the car was
up on ramps. The axle is full (I rechecked, and it isn't leaking
anyway) and it isn't hot or anything after driving for an extended
period of time at 75 mph. Is this anything to worry about? My
guess is that the stiffer bushings are just better at transmitting
normal noise to the body of the car.
TIA -b.
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