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Old 03-26-2017, 01:13 AM   #6
C10 - C90 Bill
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Join Date: Nov 2001
Location: Moneta, VA USA
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Re: GMC JE 9500's with a 637 Gas

Bob,

Appreciate the explanation on some of the internal differences. My first indication of that was how it sounded and how it performed in comparison to the 478, which we also had in our small fleet. The 478 had tons of torque and drove a lot like a 237 Mack where the 637 was a "Rev-er" more like a Detroit.
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