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Hit in the rear axle may have damaged bearings or brake parts. Jack up the side you hear noise from, put on stand, then have helper rotate wheel while you look underneath and listen to see where noise is coming from. Use length of old fuel or heater hose, one end in ear, to locate exactly where noise comes from.
it could be the wheel bearing if it changes pitch ( the noise changes ) when you turn left or right at highway speeds not touching the brake pedal it more then likely its the drivers side wheel bearing . This is if you have already check the brakes to make sure they are not metal to metal , check the brake pads first.then do the test i just talked about.
If you still think the noise is coming from the left side CV joint it would be more advisable to replace the entire axle as an assembly. For the time and effort it takes, you can usually get a rebuilt axle assembly for only a few dollars more than the CV joint and the boot required to repair one. You will need a large axle nut socket (usually 30 - 32mm) to remove the axle nut. The lower ball joint and tie rod will need to be separated along with the brake caliper and rotor, from the spindle. I would recheck the grinding noise before doing it. A lot of wheel bearings are mistakenly diagnosed to the wrong side. If the noise is loudest when turning left, most people would assume the left side wheel bearing is at fault. However if the noise is loudest turning left it indicates the right side wheel bearing is most likely at fault. Due to the weight distribution of the front end, turning left the weight all transfers to the right side, loading that bearing. Make sure thats not the case before tackling an axle.
Hello i would check your wheel bearings or sometimes called bearing hub .Jack car up prop the car with axle stands now remove your tires and rotors once removed wiggle you bearing hub left to the right your bearing hub should have minimal play one side to the other is obvious the looser play hub will be your noise you have been experiencing.most people call this road noise.
You also could have received a bad axle. Sometimes the rebuilds don't hold good tolerance and can make the same noise you are trying to get rid of. Is it full-time 4wd? Maybe the driveshaft ujoint also.
Remove wheel and check brakes. Sounds like a broke spring in the drum brakes. If you find the brakes look to be ok, inspect the axle barrings. If you can move the axle up and down or side to side any, you have some bad barrings. But I think more then likely it will be in the brakes.