I got a 2000 wj about 2 months ago and replaced the thermostat and the radiator and that solved the over hearing issue. Now I'm having issues with a clunking noise when I hit any kind of bumps. I checked to see if it was wheel bearings by doing the wheel shake test, but didn't take the assembly apart yet. Before I do that, does anyone have any other suggestions as to what it might be? A buddy of mine said he thinks it's the stock front end bushings. Would that cause it to make that noise?

 

Worn bushings can cause a clunk, bushings that break loose from their brackets or control arms will most certainly cause a clunk.

 

Also check the shock absorber bushings and mounting bolts.

 

Check brake caliper bolts are not loose
Check upper and lower ball joints on the knuckles.

 

check calipers as mentioned, also the bump stops break off and float around inside the coil springs.

 

Sway bar end links or mounts could also do it if bad enough.