Ditto on not using thr clutch, at least on a downshift from high to low axle in the same gear. Is yours a vacuum shift, or electric? Vaccum units shift smoother, IMHO. Just push the button to low range with power applied, let the shift spring wind up and "cock" the shifter, then quickly get off the gas, and back on. It should drop right in to the lower gear. On a double shift, like low 3rd to high 2nd., move the splitter first, then make the tranny shift and double-clutch a little as you move the shifter. It'll drop right in there with a little practice. Then, when you're feeling really skillful, climb into a Mack with a Tri-Plex box, and try two shifters at a time!
Jerry