When I am in a stoped position and begin to drive or turn the wheels, a loud sort of slipping or cracking sound followed by a weird humming sound seems to be coming from somewhere in the rear axle. This problem is most apparent after long car rides when the car is warmed up. I asked a mechanic and he has no idea what is wrong with it or how much it will cost to fix. Can you help me?

There is no noise in the rear axle of my 1995 grand cherokee when it is cold but after moving for 15 to 20 miles a thump is heard with full rotations of the tires. If I stop for a period of time the noise disappears however returns again when it seems to warm up again. I have checked the tires, brakes, backer plate etc however no problems found. There is no noise in the rear axle of my 1995 grand cherokee when it is cold but after moving for 15 to 20 miles a thump is heard with full rotations of the tires. If I stop for a period of time the noise disappears however returns again when it seems to warm up again. I have checked the tires, brakes, backer plate etc however no problems found.