Good morning,
This sounds like the transfer case itself is the issue.
When was the last time you changed the fluid? If it is low or the fluid is old, it will not lube the internal bearings and this is the result.
I posted the procedure for replacing the transfer case below.
Roy
Transfer Case
1. Remove the upper radiator fan shroud.
2. Remove the rear driveshaft.
3. Remove the front driveshaft.
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4. Remove the four bolts and the skid plate, if equipped.
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5. Drain the fluid if the transfer case is to be disassembled.
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6. Remove the RH and LH heat shield-to-crossmember bolts.
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7. Remove the components in the order indicated in the illustration and table.
8. To install, reverse the removal procedure.
Item 3: Crossmember Bolt Removal Note
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1. Remove the eight crossmember-to-frame bolts.
Item 5: Crossmember Removal Note
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1. Position a suitable transmission jack to the transfer case. Securely strap the transfer case to the jack.
Item 9: Transfer Case Removal Note
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1. Position a suitable transmission jack under the transmission.
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Friday, November 27th, 2020 AT 4:50 AM