Re: WJ Jeep, Sounds like differental is clunking
Did you check the fluid level in the front differential and did you take a fluid sample after driving to check for any metal in the fluid?
Also check the front propeller shaft joints (CV or U-joints) for play and check the T-case fluid level and a fluid sample.
If you didn´t change the fluid yet, i would start there, so that you can have a look inside the diff for any damage to ring gear and/or pinion. Could be diff bearing for the humming sound, but clunking is something else.