Your truck weighs about the same as an AD.
How is your clutch? My truck would only go 30 mph up hill. Turned out the clutch was slipping.
Also, what size tires and wheels do you have? The larger the diameter tires you have, the faster your top speed will be for a given rpm.
My truck also had crappy 15" wheels with low profile tires on it when I got it which also slowed it down considerably.
Proper 16" wheels with 30" diameter tires and a new clutch made 65mph possible.
The clutch was slipping a bit when I got the truck. Engine would stay the same, or increase RPM going up hills while the truck slowed down. The pedal had no free play at all. Truck would only start moving in the last inch or less of pedal travel, so I adjusted it to have some free play. I don't think it was allowing full pressure before. Anyway, now the engine bogs down when the truck slows down, so seems like it's holding well now. Perhaps not.
The wheels are the stock 17" artillery wheels with stock size tires, which according to Coker, are about 29" diameter.
