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Q: cyclic grinding noise on 1998 Jeep Cherokee

My jeep is making a grinding cyclic grinding noise sometimes when going up my very steep driveway and every once and a while it makes the noise after accelerating from a stop at slow speeds (10-15 mph). The noise stops at higher speeds. Husband has changed the u joints and drained, cleaned and refilled the rear diff. Also he recently changed my back drum pads and front brakes. He mentioned how rusted everything was on the back brakes but said he cleaned them before replacing the pads. Could it be the brakes sticking and rubbing? This problem doesnt happen when turning- but going staight. Every time he has had to jack up the jeep to fix something, the noise goes away for a while and I think that its fixed. But within a week or two it comes back. Right after he fixed the back brakes, the car had a lot more pick up than "normal" and grinding was gone-making me assume it was the back brakes sticking and rubbing. But now its grinding and dragging a bit again. Ideas??

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There appears to be at least two areas of concern. The noise at low speeds appears to be coming from the drive line. Check the drive pinion bearing, this bearing noise in the early stages are different from other bearing noises. Instead of making a groaning noise it starts out as a loud hissing or whistle noise. Next you say the noise goes away after the vehicle has been raised and work is done. Check the rear suspension. When the vehicle is raised the suspension is repositioned because it is not settled in its normal place when lowered on the ground. Make sure there are no worn busings on the rear suspension links and trailing arms.
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