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Lifted96Chevy said:
According to my calculations....you will be turning 3838 RPMs going 65 in 3rd gear....so in overdrive at 65 you'll be doing 2686 RPMS....check out this page...Gear Ratio/Tire Size Chart

That doesn't sound too bad really. I went from Houston to Iowa pulling a trailer at 70mph all the way, 3rd gear, and I was around 3000 rpm the whole way, didn't have a problem. Gas mileage sucked (10 mpg)...but thats going to be expected with a trailer and those RPMs.
 
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