I checked and serviced the front bearings, front ujoints, replaced brake pads etc. All are in excelllent shape. I also have a grand cherokee and my brother has a similar 4x4 and we have never seen anything like this before. The light and front axle shift diafram are all working as they should. I am heading for the dealer in the AM to discuss with a mechainic if I can corner one. I do appreciate your kind responses.