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All of you are correct from your point of view. However, the only problem technically is the somewhat to low flywheel inertia weight with regard to the truck weight. Else the engine is for it's time a very modern design! When I first restored my truck in 1980 until 1982 the original engine was...

bcowanwheels is right, the truck is NOT designed for "racing". The max speed governed is 60 mph in the original setting. And a good useable speed is between 50 and 55 miles. You have to accept that or quit. The other gearing might help to get the rpm down, but not realy solve the problem of the...