I'm looking at buying a used Mack with MP8 and Mdrive. Probably a CXU613. I'm looking at doing in state hauling up to 105,000 lbs, but also need the ability to bring a 90,000 lb load out of a soft field. Most used trucks a see are 2.47 and 2.60 axle ratios and 3.08's. I know the 2.47's and 2.60's are no good for what I want. What ratio's would be the best for what I want to do? Is 3.08 adequate or do I need to be at 3.25, 3.58 or more? How about overdrive vs direct transmissions? Most I see are overdrive. The price range I'm looking at, doesn't allow me to look at the 13 or 14 gear mdrives, just the 12 speeds. Any advice would be appreciated.
Best Axle ratio for soft conditions
in Driveline and Suspension
Posted
I'm looking at buying a used Mack with MP8 and Mdrive. Probably a CXU613. I'm looking at doing in state hauling up to 105,000 lbs, but also need the ability to bring a 90,000 lb load out of a soft field. Most used trucks a see are 2.47 and 2.60 axle ratios and 3.08's. I know the 2.47's and 2.60's are no good for what I want. What ratio's would be the best for what I want to do? Is 3.08 adequate or do I need to be at 3.25, 3.58 or more? How about overdrive vs direct transmissions? Most I see are overdrive. The price range I'm looking at, doesn't allow me to look at the 13 or 14 gear mdrives, just the 12 speeds. Any advice would be appreciated.