well finally dropped the oil from the rear diff took diff cover off (no drain plug) is this common not to have one jeep is 1999 diff has a tag for 1997 ?
couldnt see any thing major untill i rotated one of the wheels and saw the pinion just move so after replacing the cover and refilling diff with the 85w140 and additive
then dropped the uni off (piss farting little bolts on the thing)then when i put the socket onto the pinion nut it turned in my hand (it was loose)
so out came the socket bar and a piece of pipe and pulled it up tight now no noise
now wondering just why the pinion nut was loose in the first place but if it moves again ill rip it off and put some locktite on it