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Much thanks to SteelHeadz, Crazy4diesels and xt master. :-) The U-J’s, look and feel fine, but I am going to replace along with pinion seals as they to my knowledge are original. I am going to remove the diff cover this weekend and have a look. Also I think it is a Dana 44, as the diff cover...

I own a 1998 TJ 4.0 sport and it knocks twice in quick succession every 4 seconds at 30 mph. I think it is coming from the rear diff, but not sure. It speeds up the faster I travel and not engine rpm. It is also louder when under load but can be still be heard when slowing down or out of gear...