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When I back up I here a popping noise in the rearend,some times when going forward I here it but not as often as when in reverse?Thanks very much.Its a 2006 dodge 2500 4x4 whith limited slip,Ichanged the rear lube at 25000,It has 60000 miles now.
Classic symptom of dry universal joints. Once they start to pop and squeak you can't just grease them you need to replace them. You'll need to drop the driveshaft to know for sure.
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get it inspected, noise many times means big trouble.
are the lug nuts loose?
bad u-joint (hand checked)
or road hazard damage (hit)
? look first. see whats there,
The rear end will be to hot to touch after driving but if it is really hot (like cannot get the finger anywhere near it )then the problem will be in the diff . Possible pin ion bearings are under excessive preload by nut using a new spacer under the pinion flange or attempting to remove back lash at the pinion flange by tightening up the pinion nut. Excessive oil and the wrong grade of oil ( ordinary diff oil in a LSD diff) or running one side tyre at a different profile height to the other. The popping noise may be oil burning off ( like fat in an overheated fry pan)
Sounds like the rear end differential is going out. I had a similar problem on a customer's truck, and it was the differential in the rearend. Replaced the rearend, and the noise was gone.
If it sounds like a rumble from back wheels it may be the rear end going out. Mine has been replaced twice with used rear end. You should be able to confirm it by looking at the rear tires both sides of tire for an oil leak or wet spot on tire or rim.
Is the rearend blown into peices? if yes replace the whole thing. If not put it in reverse and have someone look to see if the rear driveshaft is spinning. If it is you more than likely need a ring and pinion set in the rearend. If it doesn't spin the problem is in your transmission not the rearend.
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