Maybe a small switch on dash, left side, small, easy to throw back and forth, metal label around it? does it have the single vac line to it? OR, is it electric? Usually instructions on how to shift it in cab, maybe on sun-visor? I have one for my 55-1 COE, don't know models or anything. Check in Shop Manuals if you can find one. Gearing in these is very low. 6.** for high and 8.** for low ranges. Slow and Slower! Twin brake cylinders on each side, expensive, hard to find. I have a manual, I can maybe check if it goes to 2-ton or not, think it does. Models to 400 in it.
