Ok, pretty new to this forum but here it goes. My sister in law has a 07 jk 4" superlift,35" bfg mud terrains,rubicon express drivelines. She called today and said she was having vibration issues with it at 20 mph. Calls back 20mins later on a tow truck. Driver of tow truck says it's her ring and pinion, when she bought it I told her to get a Dana 44 in the rear of the x model since she wanted a lift and bigger tires. It's never been off road, and really can't believe with stock gears and an auto that it smoked the r&p at 30000 miles. Is this a problem anybody has had?
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