Sounds right, that ringing sound is a clunk from the u-joint due to wear, letting off the gas makes it go from driving to driven, and the slop is the clunk, the resulting noies is travelling into the driveline, making it a bell of sort. Climb under the rig and try to move the joint, it should be obvious which it is once your under the rig. There should be no slop in the u-joint, if there is, replace it. And since you'll have the driveshaft out, replace both the tranny and diff end.
Last edited by jeepmor; 02-24-2004 at 11:15 AM..