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Alex V. · 04-10-2018, 08:36 PM

If you're confident your ratio check on the rear end is correct and it has 3.73's, and the tach is wrong, ignore the tach and enjoy the truck. I don't have, or need, a tach on either of my trucks - 60 is right around 2,600 on both, 75 is more like 3,300, and neither engine will be bothered by short runs to quite a bit faster than that (4,000+?) so I don't have to worry about over-revving it.

04-10-2018, 08:36 PM	#16
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: Need help figuring out rear end gear If you're confident your ratio check on the rear end is correct and it has 3.73's, and the tach is wrong, ignore the tach and enjoy the truck. I don't have, or need, a tach on either of my trucks - 60 is right around 2,600 on both, 75 is more like 3,300, and neither engine will be bothered by short runs to quite a bit faster than that (4,000+?) so I don't have to worry about over-revving it. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.