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Old 06-17-2018, 12:17 AM   #62 (permalink)
Grant-53
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Join Date: Feb 2010
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A lot depends on the way the truck is being used. Vibration and harmonics play a big part in engine durability. Back in the '80's a local highway supervisor put a 3-51 GMC diesel and a Clark 5 speed transmission in a Chevy C-10. I recall he got 22 mpg and had saddle fuel tanks for a 1700 mile cruise range. This was his inspection vehicle.
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