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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.
A noise is pretty tough to diagnose via e-mail. It could be any of the u-joints, differential, output shaft bearIng/bushing(transmission). I like put the rear axle on jackstands and run the truck in drive at idle and then I use a piece of 1 inch heater hose about 3 feet long as a stethoscope. Put one end against your ear and the other in the area of the noise to pin point the offending part.
It will be the ac compressor clutch that slipping when after it has been activated/engaged. This happens when the engine is winding up the compressor clutch is not engaging strong enough and start slipping. However as the engine rpm stabilize on the ac compressor has caught up (same rpm) no slipping occur and no noise. Was the clutch mechanism replaced with the compressor replacement? (however it need to be checked/repaired).
GET IT TO A MECHANIC!! Something is loose or about to collapse! Remember that vibration and noise can travel away from the source so get the mechanic to start in that corner. You need to get the following checked!
-Prop shaft mountings at transfer box.
-Prop shaft mountings at differential.
-Prop shaft bearings.
-Differential condition and oil level.
-Drive shafts at differential end.
-Drive shafts at the wheel end.
-All flexing joints in the system including UV joints and CV joints.
Good Evening, those noises can be annoying and sometimes hard to find. However it sounds like you have a front hub assembly going bad. Usually the noise goes away when you veer one direction or the other. I have heard some transfer case noises but they usually do not go away on turns. Check those front hub-wheel bearing assemblies and see what you come up with. Hope this points you in the right direction.
You have a u-joint in the rear drive shaft that is no good..Look under the truck at every one and look for rust next to the caps..Also look at the mid shift bearing that is in the center of the rear drive shaft.It is bolted to the frame and the drive shaft goes through the center of it..Hope this helps you and that is almost 100% the problem I promise..Have a great night....