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It takes power to push these trucks fast, gearing only helps a little bit. This is because of poor aerodynamics. Wind restiance goes up quite a bit above 60mph in one of these trucks. I would say your motor proably needs somemore power. It should be able to go about 100mph with 3.73 gears without rapping the motor too tight. I would say put on the headers and some dual exhaust. It should help out a bit.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride.
'70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck.
'97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg
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