Accelerating and stopping!

Hi all! I have a 2001 XJ with 3" Skyjacker Lift and 31" TRXUS's. Just put a Jasper engine in it in January and it's running great. One outstanding item that I have yet to figure out, is with regard to some play underneath when accelerating and stopping. Initially I had a clunking sound, replaced the transmission mount and now that is fine. I think that is may be something with the driveshaft but I am not sure. Has anyone run into something like this before?

It's hard to explain because you can really just feel it. Theres no major sound. It sorta feels like something coming out of where it should be when accelerating and moving back into place when stopping.

Any help with this would be greatly appreciated.

Thanks!

Ken

Check your U Joints they make that sound/feel when they are going bad

i had something similar w/a 78 bronco. turned out the u-bolts on the rear axle had come loose and the axle was walking fore and aft on the leaf spring. its kinda a shot in the dark, but its someplace to start.

Check your exhaust hangers, especially the one on the transmission crossmember.

rear driveshafts often clunk when dropping off the throttle, its fore and aft play in the slip yoke

Awesome...will check all those out...

Thanks guys!