This is in my wife's bone stock 02 WJ, 4.0 with the full-time 4wd system.

The only time I hear the noise is during braking. Sounds like a rapid clicking or rumbling coming from under the dash. I know it has to be coming from the front axle or possibly the t-case, but I'd like to get a starting point before I begin taking things apart.

The noise seems to come and go, brakes are in decent shape.

I'll try to record it and post a YouTube link the next time I drive it's.