Hy John Leatherman, I have no idea what a fair price would be, it seems to vary depending on where you are, and of course the condition of the vehicle. I think the ratio for a 1 ton is in the 5 to 1 ratio possibly 5.14 to 1, I think that a constant 65 m.p.h. would be pushing the engine pretty hard. Other ratios are available the more common is 4.56 to 1, or the somewhat elusive 4.1 to 1. does the truck currently have 18" wheels on it, if it has anything other than 18" or tubeless 19.5" on it, then you could upgrade to those and lower your r.p.m. at any given speed, hope that helps.
