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Discussion Starter #1
2000 jeep tj automatic, 37" tires either 4.88 r 5.13 gears (installed on prior owner) . i am chasing a phantom whine. i suspected driveshaft or rear diff. i took the rear shaft out, re-serviced the rear diff. drove it in 4wd hi, still whines. it sounds like its something centrifugal (spinning) my friend has pretty much ruled out bearings. i tried going through the gears in 2wd without the rear shaft in to see if it might be a t-case or tranny prob. no sounds. starts 15mph-25mph and up. me and my wife did notice a smell after a short highway drive, as if somthin was heating up. maybe that was in our heads. i had my t-case serviced, topped off my tranny fluid (but not draines and re-serviced) . so, any ideas friends?
 

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Use the search button and search whining, it should pop up a few threads.....mine was doing that pretty bad, and it was annoying me. I just had an exhaust put on yesterday and now there is no whining.
 

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thanks for the insight, though i dont think it is exhaust related. if it was that means it could be duplicated in neutral right?
 

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The whine on my 2000 tj turned out to be u joints in the steering knuckles. Did not really notice until gettingup to 45 mph. Should begetting back from the shop monday so will know for sure then.
 

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From Superiors site
What is this whirring noise?

Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears.
A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up.
Rumbling or whirring at speeds over about 20 mph can be caused by worn carrier bearings. The noise may change while turning.
Regular clunking every few feet may indicate broken ring or pinion gears.
Banging or clunking only on corners can be caused by broken spider gears, lack of sufficient positraction lubrication, or worn positraction clutches.
Rumble while turning may indicate bad wheel bearings.
A steady vibration that increases with the vehicle’s speed can be caused by worn u-joints or an out of balance driveshaft.
Clunking only when starting to move or getting on and off the gas might be loose yokes, bad u-joints or worn transfer case or transmission parts.
 

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Discussion Starter #8
good post thanks, gives me more to investigate. i had the top and doors off today, had my wife drive while i put my head to the floor. its deff from the t-case and forward. i saw a youtube video of a t-case taken apart to show gears. it made a similar sound at low speeds im getting, but it was a different model car. do all t-cases have chains or do some have interconnecting gear set up? ive ruled out both diff's through troubleshooting. it seems to be (and lets hope it's nothing else) trany, t-case, axle assembly minus the differential/gears
 
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