Sorry- forgot to check back on this.

Mine won't stay in 4 wheel low - it jumps out on its own. I have checked the shift linkage, and it isnt an engagement problem. It also seems like the chain is stretched because in 4wheel high, under load, i have experienced what seems like skipping of teeth or the chain slipping.

My truck has 311,000 miles on it. previous owner rebuilt the trans, but i dont think they touched the transfer case at the same time. I only put a couple thousand miles on the truck each year at this point. I would like to get it working the way it is supposed to - as this is my tow vehicle.