LPTinc Posted April 14, 2019 Share Posted April 14, 2019 I just bought a 2004 Mack cv713 Granite, tandem axel dump truck, 370 hp with the mack 10 speed trans. 22.5 x 4.25 front and 24.5 rears. My issue is when loaded, when I shift I loose to many rpms and it takes me out of the power curve, it will pull out gradually but I know it's not good to lug the motor. The trans won't let me shift any faster like my eaton 8LL. I have to let rpms drop, I find myself sometimes in the 1200 rpms in the next up gear if pulling a slight grade. I can't stay in the power curve. As with my other trucks, 1450- 1500 rpms is where my power is. Suggestions? I'm thinking transmission change? I'm not sure of the gear ratio in the rear but at 70 mph I'm at just over 1800 rpm, a friend has an 06 same setup and tells me he's 80-85 mph truck witch I don't doubt. I feel this could easily fixed with the wright combinations. Suggestions? Thanks, Lou Quote Link to comment Share on other sites More sharing options...
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