I'm a novice. Have used my '73 K5 Blazer on the hunting lease for several years. I need to know operating procedures for shifting transfer case. It is real hard to move at all. A freind said shift on fly, that just grinds real good. I brought truck home to work on this and steering box but don't know if it is even working. I unlocked the front hubs and could not even get any gear. I was able to put it back in 4w lo and lock the hubs to get home. Don't think the rears are even working. I know how to adjust linkage and am going to do this first but I still need general information on how to change from lo to hi etc... with motor running or not, in park or neutral??? Please help.