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Re: 60-66's with 3.42 ratio's and 700R4's please chime in
That is not a huge difference in gears. I would concentrate more on your stall converter for your transmission. Maybe 2200 to 2500 if you want decent MPG and keep some power. I have a sbc 350, 700r4, and 373 with 2000 stall. I built mine for daily driving and mine is a dog off the line but has tons of power left at 80mph with very low RPM.
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Squarebody guy
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