Loud Whining noise from front diff

[mtHIEL432]

I have a 1993 jeep Cherokee and i had it now for 3 years and i want to fix this whine noise that is coming from the front diff. I have been around cars my whole life so i am not a rookie. last night i throw a new t-case in her and a 2" lift. I thought the chain was the noise so i rebuild the t-case and re installed it the noise was still there o i was mad as hell but it was a fun project. But i need a write up and pictures on how to rebuild the front diff and the tools ill need. This noise is killing me and i need to fix it. if there is just one part i can replace instead of rebuilding the whole thing please tell me and explain how to do it in detail

Thanks Guys
Mike T

[Orangeamc13]

Before you tear into the front diff, make sure it's not the front driveshaft. The double cardan joint has a centering yoke in the middle, these are notorious for making a whining noise and driving people crazy. Remove the driveshaft and take the Jeep for a ride.
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[mtHIEL432]

The whining noise only comes when the 4Wheel drive is engaged so even if i did take the drive axel out the fluid would go every were when i took it for a ride. When the jeep is in 2 wheel drive no sound what so every but as soon as i put in 4 wheel the whining comes and gets louder as i go faster.