Truck for arctic fox 1140
Hey guys, Im planning to buy an arctic fox 1140 soon. I need to buy me a dually to carry that heavy camper Id like to buy a ford f350 diesel but what ratio should i get ? Seems like we ca...
Forum Discussion
It is really a misconseption that a 4.10 will give worse mileage than a 3.55. It still depends on motor and transmission ratios. What is the RPM when in the middle of the motors torque curve? Generally speaking I have found that my Cummins is happiest at around 1800 RPM at 70MPH. That is with a 6 speed auto and a 4.10 rear end. At that my dually winds up returning around 18MPG. Towing a 13,500 pound fiver I can cruise all day at the speed limit with cruise control set. Could I do the same with a 3.73 or a 3.42 rear end? Probably, could I get the same fuel economy? Who knows. All I know is my motor is happy running at 1800 RPM.
