Now this is a 1999 Grand Cherokee with a 4.7L and NV247 tcase. We got this knocking sound like you were knocking on wood. Whenever the Jeep is in drive or reverse. I removed the front driveshaft and the noise went away. So naturally I replaced the front driveshaft, noise still there. I replaced the driver's side axle, noise still there. Replaced pinion bearings and tightened down pinion nut, noise still there. Checked all the spider gears and ring and pinion, no metal in case or fluid. I found a TSB about cutting a groove in the tcase output shaft nut to allow better airflow when the driveshaft is butted up to bolted down, noise was still there. I'm at my wits end other than replacing the whole front axle. When the vehicle is driving on the lift you can feel the knock in the front axle assembly, yet there is no damaged part when disassembled.
Anyone have a clue?
Anyone have a clue?