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best way to increase top end speed in a 1967 K20

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04-01-2009, 05:44 PM	#1
psychobilly451 Registered User Join Date: Feb 2009 Location: Poughkeepsie NY Posts: 63	best way to increase top end speed in a 1967 K20 what is the best/easiest way to increase my top speed? I used a gear ratio calculator but I must have missed something. It said my top speed should be about 115mph but its more like 50ish. Is the transfer case something other than 1:1 ratio in 2WD High? __________________ 1967 K20 Stepside Longbed 250-6 sm420

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