What is this sound?
 

I have a strange sound coming from the rear left of my car. grind pause grind pause grind. It comes on during hard acceleration and when I accelerate and turn right, but not left and not during braking. I checked my CV joints and they appear to be fine. They were also rebuilt about 6 months ago and passed the test of racing. The engine sounds fine and I checked it out with a stethoscope. I can't seem to repeat the sound when it is on jack stands and everything looks fine. The only thing I can think of is maybe a bad bearing or bad e-brake. The e-brake works fine on that side of the car but not so well on the right. There is also no rubbing and about 90k on the odometer.

Does anyone have a clue as to what this is? If it is the bearing is there an easy way for me to confirm that suspicion? Any help would be greatly appreciated.

Thanks in advance,

-Patrick

If you could duplicate on the jackstand then if it were the trailing arm bearing you could unbolt the halfshaft to that side and confirm the bearing You can be assured it will get worse. The last one I did sounded like a bad trans until I unbolted the halfshaft
Bruce

Does it increase in frequency with road speed? That would point to the wheel bearing.

Check the lug nuts to make sure they are tight.

while standing to the right of the rear bumper, press against the bumper with your knee while watching the rear wheel. If the wheel wobbles, then you have a bad bearing.

You can also check the RR wheel by putting your hand against the wheel to see if the brake caliper is dragging.

Mine did that also I was planning to change the bearings so I thought that might fix it but no joy. So next time I was in there I bent out the brake disk dust shield and that did it.

I vote wheel bearing. Just had one go out 2 weeks ago and it made an aweful scratching noise like you described.

Craig

wheel bearing. Replace both sides if that turns out to be the problem.