my rearend moves side to side.

What is your question?

When I back out of my drive way or hit a bump at an angle the rearend moves alittle side to side it feels like the axel is moveing and if the jeep is seting still I can push on the tires I can push on the tire and it feels like it moves the axel the jeep also has a 4" lift on it there is no noise comeing from the rearend and other then the movement it runs good what could it be