Transmission to Transfer case leak?

[Jack15T]

Hi Folks, I am new to Auto transmissions. I have always had a manual. I recently purchased a 1971 K20 with a TH350. The transmission is losing fluid at a high rate but it doesn't appear to be leaking externally on to the ground or anywhere that is obvious. I refilled the transmission and decided to check the transfer case. When I pulled the fill plug, at least a pint of transmission type fluid came out of the transfer case. Is it possible for the auto trans to be pushing fluid into the transfer case? Thanks, Jack