Light knocking on my 01 xj when slowing down and when accelerating as well i feel vibes from it thru the floor not sure wht i could be all helps appreciated thankss

May want to check rear brakes and drums. Mine were warped and I didn't realize it till after I installed new shoes

You might check your exhaust pipe & engine/trans mounts. Trany touching the cross member will defiantly "vibe" the floor.

First place to look. If this is the issue, check your trans mount, engine mounts, and make real sure the engine mounting brackets don't have broken/loose bolts. It's in your hands now.......

Maybe u joint ?

Yeah definitely check your U joints. Hop under there grab your drive shaft and try moving it back and forth. If it moves, you need to replace em. I just had the same problem, and it was a rear U joint

im having the same noise and i just replaced both of my u joints
any ideas

I have the same noise. in my case it turned out to be the rear differential. the noise travels through the driveshaft. and it sounds on the drivers side, right? check the fluid of the differential. I'm going for a ford 8.8 swap, I'm just getting the parts together, hopefully by next month I'll have it installed. good luck.

thanks for the info

Its u joints.

If you lay underneath you can prolly move u joint around a little and you'll hear the clicking.

For me, the u joint wasn't seated properly in the yoke and it makes the u joint move back and forth a bit hitting the bearing caps.

Happens almost everytime I take off front driveshaft.