What do you consider to be "high RPM"? Most of the folks here on the Stovebolt forum start getting sweaty palms and heart palpitations if their engines approach 3K RPM, but the things were designed to turn closer to 4K all day every day, especially in the big rigs with the 4 speed trans- - - -2 speed rear end setup. Forcing the engine to run lugged down at the bottom end of the horsepower curve is actually harder on the engine than letting it stay wound up.

Did Chevy ever actually build a 3-ton truck? I thought GMC was the only one that rated them above 2 1/2 tons.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!