Assistance needed please.
I tried search but am not fully satisfied.

Lately i have been having a huge noise from the drivetrain. I opened up the front diff plate. The bearings all look/feel fine. There is more back lash than i like but no excessive where marks on the gears. I closed it up with new oil.
I had a bad oil leak on the oil cooler (545 rfe) which I now replace with an aftermarket cooler.
It use to overheat a lot, so bad the shift points would change to high rpm.

It was better for a small while after I topped up the gearbox fluid.
Now it is bad. I hear a high pitched noise whilst driving yet cant find anything wron with front brakes. All shafts feel good. U joints and cv's.
when i stand still idling there is no noise.

It could be the diff. But what about trasfercase?

The wife believes the noise is coming from the front. When I get home later, i will disconnect the front shaft and try again.

Please help me identify it.

Thanks

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2005 Jeep Cherokee Renegade
2.8 CRD Auto
MOPAR factory bits ......for now.
60mm Home lift. spacers front and coil springs rear.
Future: (1) LSD front. (2) Locker rear. (3) If possible Rubicon transfercase.

When the engine fails a 4.0l V8 smallblock.

Could it be tires? What kind a tread do you have? Did you try front to rear tire rotation to see if it changes things?

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2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Proudly supporting CRD vendors, and their development of quality parts and accessories.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

Check the front driveshaft,t-case side CV boot is known to fail and cause noise and vibs.