The 7.3/4r100 is much different than the 6.0/5r100 when it comes to gearing and bigger tires. If you had 4.56 gears and 35inch tires on a 7.3 you would have pretty high RPM if cruising at 75mph or higher
Haha what is a 5r100? I would imagine you mean 5r110.... The 5th gear in the 5r110 is the...