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It could be differential bearings.
A bad rear differential causes vibration, noise, and fluid leaks. This can impact a car's acceleration and driveability, and cause very serious problems if not addressed.
The noise is due to bad gears or bearings in your rear differential.
Front Rear End? Does that make sense? Front differential? maybe? Low fluid, wheel bearing, choppy worn tires?
The bearings are damaged.
It could be your rear breaks / including the emergency breaks, or your rear differential
Broken gears. The differential or ring gear or pinion gears are broken.
rear differential got lube? rear wheel bearings?
After the Jeep is warmed up, if the creaking noise is noticable during turns at low speeds, then its probably the rear differential. Go to the dealer and have it serviced. All they do is replace the fluid and seal but they use a special lubricant additive.
Can be a rear differential problem. May be Low of lube or gears are worn. Can also be a transmission problem.
If its coming from the rear differential, add some additive, available from chevy.
it sounds like a humming or whinning noise, what year is the truck if its from like 01 or up those trucks have a lot of wheel bearinig problems that some one might misdiagnose as a differential noise or it could be chopped tires making the noise.