Whine in transfer case

go to the magicmechanic website and send him this--hes the best there is and will rply

I think removes the tyre both then check its gear box bearing noise or clutch plate bearing noise

still bad? doing old zero answer posts. (my bag)
finding noise is hard, and takes skills and can be dangerous.
my guess ????? it makes noise only moving.????
only clue is front, and presume outside of car and not under dash.

if car makes noise moving only, it can be dangerous , driving or even trouble shooting.
does it make noise in turns, or bumps,or loads (hills) or in all gears. or down hill, or coasting.?????
when it starts, does letting of throttle stop it, or more throttle>
or down shifting.? or cutting throttle and shifting to neutral.
I added many check to Doesn't seem connected to anything

my guess is the whine will progress to full time, many times this is true.

good FSM cover noise, here is more.
(tools can do wonders.)
http://www.fixkick.com/NOISE.html

I would worry

Pull the transfer case & take it a part

You most likely will find the chain is loose
& wearing away the case from inside,that is
pretty much what your saying.

Don't install someone else's used junk from
a salvage yard,that is what the pros will suggest,
fix yours.

Bearing problems in the manual trannies is common, tear it down and rebuild it.

Suspect a worn left side spider gear or it's bearing in the differential. If a limited-slip differential, the left side clutch may be grabbing somewhat. In any case, the differential will need to be removed from the case to service any worn or defective components. Rear end service is not for inexperienced mechanics. Have you checked the fluid level in the differential? Hope this helps!

well, without hearing the noise myself, i could guess that the torque converter clutch might be going bad. the torque converter is the part that transfers the power from the engine to the transmission via viscous fluid motion, the converter also has a clutch that internally provides a direct connection inside the converter for better fuel economy. but as with anything labeled as a clutch, it wears down to a point where is slips. the noise your hear could be the torque converter clutch slipping. i owned a 90 astro van with the same drivetrain that made a noise similar to what you speak of up hills. while driving up hills, fully depress the accelerator and if the clunking noise occurs, then the whine goes away as you accelerate faster in a lower gear, very likely this is the case. you would have to have a transmission shop diagnose further. i drove that old van for five more years cause i didn't want to pay to have transmission repaired. it can be very expensive.

Give a try by change your transmission/filters and Transfer case oil.

We have the same problem at our shop. We haven't rebuilt the front differential yet. We tried 3 different shafts on 2 different Jeeps and the noise is on both just the same. By greasing the front driveshaft cv joint, we got he noise to quiet some, but it is still way to loud. With the driveshaft out, the noise is gone. We are about to buy a new shaft from the dealer for $600. There are some service bulletins about some noisy driveshafts.

i'm thinking that your tires need speed balancing :),, if is not the tires then one of your bearings on the hub needs replacing or the exhaust has a hole somewhere.