Hmm doesn't look like a split case transfer. Sorry can't help you. Try looking at the linkages and figure out where the lifting motion would come into play. Have someone up in the cab play with the selector lever, while trying to figure out how it should move.
look underneath and take a picture (s). try pulling back and then sliding to the right. I think that is the wrong knob. that's if you have a split case transfercase
Got a new tool to help separate electrical connectors. Might have to modify if it doesn’t seem to work like I want it to. This is to squeeze the little locking tabs
No shame on using cardboard 😉 most of us Ak use cardboard. I never taped it for waterproofing 🤣 come spring time throw away next winter install a new piece 👍