I just purchased this great truck. The problem is I believe I have a turbo 350 NP 203 transfer case. But I can only shift into L loc or H Loc when I am in park. I have read a couple articles that have stated that is typical for an NP 205 but nothing that supports the same for the np203. In addition, is this typical for the np203? I have a 1977 Scottsdale with a 6" suspension lift and 35"x12.5 tires. Could there be an additional problem or is it user malfunction?