The other day some friends and I were negotiating a couple of hills that required some crawling to get up (25 degree + slope according to my inclinometer) and as soon as I had engaged it into 4 low it acted ok until one of the wheels began to spin and started making this horrid grinding noise like it wasn't in gear. I stopped, backed up and re-put it into 4 low, I tried to go up again and it did the same thing. I tried to shift it over one more time, and viola it engaged. We got under the truck after we got home and saw what looked like a bar where the 4wd linkage to the transfer case is, it appeared as though it was rubbing when it was trying to go into 4 low, but after putting a hand on it we found out it was not. I don't know if it is inside the transfer case, or something with the shifting into 4 low, but I have to shift and drive around, shift again and it will engage if I am lucky.... Anyone else had a similar problem?