Dodge Repair Questions? Ask a Mechanic for Answers ASAP
With the rear wheels off the ground, manually turn the driveshaft to try and duplicate this issue to determine if the gear set in the transfer case or the pinion gear in the rear axle is the issue. If both are fine then look at the brakes, and caliper brackets for a possible cause for this.
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Glad your getting it resolved. Sorry I was not able to help you figure this out prior to towing so I could earn a rating.