You're right crenwelge smile My truck was a service vehicle for the city of Carlton Oregon. It may have had a dump bed at one time but I'm not sure of that yet. At 45 mph the engine is screaming! It likes 40 much better, LOL.....My tires are 9R-22.5. They stand approx. 38" overall. I know of a company that sells 5.83 gears that I could swap in if needed. It all depends on the gear ratio of the axles coming......Thanks!