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Re: Gas Mileage/ Top End Speed for 72 C20
If your truck has the factory drivetrain it will likely have 3.54s w/automatic,if you're saying you have a 402,and the trans will be a TH400. Powerglides were gone by '72. The optional ratios go down (higher ratio) from there. I've driven all day on the interstate at 75-80 mph with 4.10s on a C/20. Maybe you aren't coming out of 2nd.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"
GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim
"Don't call me a redneck. I'm a rough cut country gentleman"
R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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