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What would be causing a loud rumble noise that sounds like helicopter in the rear end of 1996 Grand Jeep Cherokee Laredo It also shakes car when reverse or stopping starting off?

Possible Causes:

- Worn or damaged rear differential bearings.

- Damaged or worn ring and pinion gears in the rear differential.

- Worn or broken flex disc (also called a guibo or doughnut) that connects the driveshaft to the rear differential.

- Driveline imbalance due to worn or damaged universal joints or a bent driveshaft.

- Damaged or worn transmission mount.

- Worn or damaged transfer case mount.