| [GMCnet] Final Drive. 4:10 [message #222227] |
Fri, 13 September 2013 00:44  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member |
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Have a 78 Royale, 403, and the 3:70. Sometimes my GVW is in the 20,000 lbs range. Depending on the trailer I'm pulling. You've herd about how the short stroke, big bore 403 comes into it's own above 3,100 rpm's. So, so true, When I got the 3:70 in 2004. Best change that I ever made to that GMC. The 4:10 wasn't out yet. Engine, and trans run cooler, and my mileage went up. ( Not a lot ) Thinking of selling the 3:70. And going to the 4:10. Most 1 ton trucks run 3:70 tops, to 4:88. You could keep it above 3,100 RPM,s more of the time.When I'm in the mountains. I shift it down. And run it up to 4,500 RPM's. And just leave it there. The trans at that point is running a lot of fluid to that cooler. And the load on pistons, rings, and bearings is reduced. There is 145,000. miles on the clock. Runs great.
Bob Dunahugh GMCMI Member
78 Royale4 Yenko Chevrolet's
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