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the reason for slipping after sitting for months is the converter drians back and it will only fill in neutral or rev with a stock valve body the are ways to fix this .you can install a check valve in the return line which will prevent drain back also you have to remember to check the fluid...

i'd check the transfer case linkage first make sure you're getting full movement but it a very good chance the range fork in the transfer case is worn through and letting the engaging hub slide back it will try to go towards low cuz how the cut of the planet moves it when load it applied tthat...