If your rear is indeed a 7.20 it is a 45 mile an hour truck. It could have been a fire truck or a government truck. A 2 speed could have been a 6.40/8.72 or a 5.83/7.95. With either ratio, you can go 60 or more. What size tires do you have? However, if you aren't accustomed to those things, they re going to be noisy with a steel fan and no fan clutch and very little noise. But the engine is actually happier wound up than it is lugging.
