Jeep Grand Cherokees are likely to have several common mechanical problems. The problem that we cover today with noisy differences (rear ends). While it is acceptable for Jeep differentials to make some noise, it is not good to ignore the sounds that are more than moderate or if the noise is much louder. Usually rear end Jeeps whining noises are rated on a scale of 1-10, anything under 5 is acceptable and does not deserve compensation. If a roaring sound is heard it is another matter, roaring noises should be investigated immediately. I rebuilt hundreds of rear ends and out of these, approximately 80% of them were jeeps. Also I worked Jeeps are not hunted road or abused in any way that I could see. They were derived principally as a regular family car would, so this leads me to conclude that this is just a common problem due to the design.
roaring noises are one of the most Common sounds a Jeep Grand Cherokee is the back end. As I mentioned earlier, if the roaring noises are heard it should be treated as soon as possible. Typically about 45 MPH when the sound will start to come from the back end. If roaring is heard at all speeds or parking lot speeds, the problem grew. Roaring noises are worn and pitted bearings. Carrier levels (which are the lateral bearings) are the most common bearings to fail. Next are the pinion bearings, especially if a pinion seal was replaced at some point and the bearing preload was excessive. This means that the gear nut is overtightened. Over-tightening of the gear nut can cause excessive load on the pinion bearings and may support the bearings in a short period of time. If the replacement bearing is delayed too long, the metal can travel through other parts of differential oil and damage moving in the differential. This can cause accelerated wear of the ring and pinions. So, if caught early enough, the bearings can be replaced without replacing the ring and pinions.
ring gear and Pinion that are worn too make a noise whining or buzzing, sometimes accelerating, sometimes on deceleration. And they are more expensive to replace than just the bearings. The rings and sprockets can make a whining noise without a roaring noise being present bearings. But when replacing the ring gears and other levels, including two levels of gears and support bearings are recommended to be replaced also. The axle bearings should be inspected, but they are farthest differential gears and bearings, so they will most likely OK especially on lower mileage vehicles.
rear ends opportunity in my opinion, should be avoided for Jeeps. The reason is that this is a common problem, the chances of getting a good one salvage yard is thin.
Noise in the car park just could be limited slip clutch noise (posi-traction). In this case, try to put an additive designed for clutches. Ask limited slip or posi modifier additive. Drive the vehicle will allow some of the modifier into the clutches and hopefully prevent capture.
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