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Damaged gears in the transfer case.
get the seals checked out around the transfer case and tranny
None, as long as the transmission and transfer are in neutral
replace the seal
Some auto parts place told me that the transmission, transfer case, and differentials use 75w90
You can buy a shop repair manual. Haynes or Chiltons are the preferred choices as they are your less expensive options.
Take out the transfer case and the transmission. It's not too hard, just keep track of the wiring connections, etc.
The first step to any successful repair is diagnosis. If you can't identify exactly what's wrong with it, you won't be able to make that repair.
Noises from transfer case
Remove all wires attached to the transfer case. Remove the driveshafts. Drain the fluid out of the transfer case. Place a transmission jack under the transfer case. Unbolt the transfer case from the transmission. Unbolt the crossmember the transfer case rests on.
What does a transfer case shifter motor do