Jeep Grand Cherokees are liable to having several widespread mechanical problems. The issue that we cover as we speak is with noisy differentials (rear ends). Whereas it's acceptable for Jeep differentials to make some noise, it isn't good to disregard noises which might be more than average or if the noise is noticeably getting louder. Often rear end whining noises from Jeeps are rated on a scale from 1-10, something beneath a 5 is acceptable and would not benefit a repair. If a roaring noise is heard this is one other matter, roaring noises should be appeared into right away. I've rebuilt lots of of rear ends and out of those, approximately 80% of them have been in Jeeps. Additionally the Jeeps I've labored on were not driven off street or abused in any approach that I may see. They had been mainly pushed as an everyday family car would be, so this leads me to conclude that this is just a common downside as a result of design.
Roaring noises, are one in every of the most typical sounds a Jeep Grand Cherokee makes from the rear end. As I mentioned earlier than, if roaring noises are heard this should be addressed as quickly as possible. Usually round 45 MPH is when sounds will begin coming from the rear finish. If roaring is heard in any respect speeds or at parking lot speeds, the issue has progressed. Roaring noises are from worn and pitted bearings. Service bearings (which are the aspect bearings) are the commonest bearings to fail. Subsequent are the pinion bearings, particularly if a pinion seal has been replaced in some unspecified time in the future and the bearing preload was excessive. This implies the pinion nut was tightened an excessive amount of. Over-tightening the pinion nut may cause an excessive load on the pinion bearings and can put on the bearings in a brief time frame. If the bearing substitute is postponed too long, steel can journey through the differential oil and harm other shifting components within the differential. This could cause accelerated wear of the ring and pinion gears. So if they are caught early sufficient, the bearings can be changed without changing the ring and pinion gears.
Ring and Pinion gears which can be worn excessively make a whining or humming noise, generally on acceleration and generally on deceleration. And they're dearer to replace than simply the bearings. The ring and pinion gears could make a whining noise with no roaring noise being current from the bearings. However when changing the ring and pinion gears the other bearings, together with two pinion bearings and provider bearings are beneficial to be changed also. The axle bearings needs to be inspected however they're the farthest away from the differential gears and bearings, so that they more than likely can be Okay particularly on lower mileage autos.
Noises within the parking lot solely could just be a restricted slip clutch (posi-traction) noise. In this case try putting an additive designed for the clutches. Ask for restricted slip friction modifier or posi additive. Driving the car some will permit the modifier to soak into the clutches and hopefully prevent them from grabbing.