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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.
Hubs will be temperate depending on braking. If there is a failure with a wheel bearing or a brake shoe you will experience grinding noises, which is friction and will cause things to get abnormally hot.
How many miles on your 328? My son's car was making a grinding noise and our independent mechanic told me it was the rear differential. I assumed he was correct and bought a replacement. However, before I installed it, I noticed the outer 3/4" of his passenger side rear rotor was discolored and no longer shiny. His brake caliper was grinding the rotor! It was because the hub bearing was so badly worn. I replaced the bearing and all is well.
Most newer cars have a bearing that is pressed in to the hub. In order to do the repair you should have to replace the entire hub. This is actually easier and cleaner because the bearings are lubed, sealed and pressed in the hub. They usually cost around $30 and should be available through your local parts store. In most cases the hub is held on by a large nut so I recommend that you make sure you have a socket that is large enough.
is the noise is constant when you are driving is a bearing , is the noise is when you brake, check the brakes..jack the car and spin the tire you will here the noise ..hope this was very helpful..
The bearings should be inside the drum assembly.The brakes do not have to come off. The bearings may have to be pressed out if they are sealed type bearings.
My advise is to adjust the rear brakes. The drum should not move in a side to side fashion. adjusting the brakes will also more than likely take care of that anti lock brake light also. adjust the brakes up to where the rear wheel will spin but you should be able to hear the brake show dragging slightly on the drum.
Sounds like the bearings are going out in the rear hub(s). Drive the car for a few miles (if it is safe to to do). Park it and check to see if the wheels are warm, or even hot, in their center cap area. This will indicate excess friction from bad bearings. Replace the whole hub. It's an easy DIY job, if you are so inclined. Part cost should be just over $100. per axle. Shop around to find a good price. I recommend Timken hubs. best of luck.
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