Ok guys, I need some help diagnosing a terrible grinding noise coming from the rear of my car. It almost sounds like brakes grinding. It will make the noise anywhere from 30 mph upwards. It will make the noise no matter if the car is in gear or neutral, if the brakes are applied or not, and if I'm going in a straight line or turning. These are some things I've checked or changed.
1) Checked both axle nuts torque. Both are torqued correctly.
2) I checked wheel bearings. No play from 12 to 6. There is a slight amount (very slight amount) of play from 3 to 9 on both wheels. Would this indicate wheel bearings are shot?
3) I checked to make sure dust shield was not making contact with rotor. It is not.
4) I checked to make sure rear brakes weren't scrubbing. Both wheels rotate easily so that's out.
5) I replaced an axle seal bc diff fluid was leaking. Everything went well and leak has stopped.
6) I changed diff fluid. I used Royal Purple Max Gear 75w 140. It is supposed to have friction modifier in it, so I did not add any. See any problems with this?
I'm hoping there is nothing wrong internally in the diff. I'll be putting the car back up on jack stands this evening. I'm going to get my brother to get the car to ~40mph and listen for the noise. Any help would be appreciated.
1) Checked both axle nuts torque. Both are torqued correctly.
2) I checked wheel bearings. No play from 12 to 6. There is a slight amount (very slight amount) of play from 3 to 9 on both wheels. Would this indicate wheel bearings are shot?
3) I checked to make sure dust shield was not making contact with rotor. It is not.
4) I checked to make sure rear brakes weren't scrubbing. Both wheels rotate easily so that's out.
5) I replaced an axle seal bc diff fluid was leaking. Everything went well and leak has stopped.
6) I changed diff fluid. I used Royal Purple Max Gear 75w 140. It is supposed to have friction modifier in it, so I did not add any. See any problems with this?
I'm hoping there is nothing wrong internally in the diff. I'll be putting the car back up on jack stands this evening. I'm going to get my brother to get the car to ~40mph and listen for the noise. Any help would be appreciated.
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