TOMMY , RANDI IS ABSOLUTELY RIGHT ON THIS , FIRST IF YOU HAVE THE LATE 88AND UP MUA TRANS THERE IS ONLY ONE 5TH GEAR COMBO IF I REMEMBER CORRECTLY AND IT IS ABOUT 16-16%, THE OLDER MSG TRANSIT WAS AROUND 18 % NOTHING OVER 19% , BEST THING IS TO TRY TO CHANGE YOUR CRUISE SPD WITH TIRES AND GIVE A LOT OF THOUGHT TO WHICH ENG YOU A RE GOING TO BE USING, NO ISUZU ENG THAT WE EVER GOT IN THE U.S HAVE ENOUGH TORQUE TO MAINTAIN 75MPH AT 2200 RPM WITH OUT LUGGING THE HECK OUT OF IT AND THERE GOES YOUR MILAGE , A LIGHT WEIGHT EARLY PICKUP WITH THE NEW 3.5 AND A SET OF 4.11 GEARS AND YOU MAY MAKE IT , THE EARLY DSL AND THE EARLY 4 CYL GAS JUST NOT ENOUGH TORQUE, JERRY