If there are no leaks then we most likely have an issue with the input shaft seal to the transfer case.
Basically the input seal keeps the transmission fluid in the transmission but I would remove the fill plug and see how much fluid comes out.
Clearly there should be no fluid coming out of the fill plug so if there is then that is where the fluid is going and the transfer case needs to be removed and replace the seal.
Please see the info below on how to check the fluid. Please let us know if you have questions on this. Thanks
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Wednesday, August 25th, 2021 AT 2:25 PM