I have had a high pitch whine'ing noise when I accellerate and decellerate. The pitch changes with speed increase/decrease. I bought this Jeep about 6 months ago.
My TJ is a 2002 X, 5spd manual. When I press the clutch in, the noise decreases dramatically or goes away alltogether. It has 60K miles.
I have done a lot of searches and checked the usual suspects. I have changed all the fluids in the Jeep(oil, power steering, TC, manuall transmission, differentials).
At first, I feared that it might be worn out carrier or pinion bearings. I had them inspected by a well-respected offroad specialist shop, who also proceeded to change the fluids. They do a lot of regearing for jeeps, so I trusted them more than the dealer. They reported back that the bearings are in great shape, as are the gears. They believed the noise is coming from the manual transmission, and that it is normal. They suggested I swap the fluid to something like Royal Purple, and see if that helps quiet the noise down.
So, last weekend, I drained the transmission, and replenished with RP syncromax. It shifts a little better when cold, BUT the noise is still there.
I assume that it can't be the wheel bearings. If it was the wheels, I would continue to hear the noise when I press the clutch in while moving.
Maybe this is normal Jeep noise, but it is driving me nuts. Is there anything else I can do to eliminate this noise?