SweetLou wrote:
Cummins12V98 wrote:
"When towing, whatever gear keeps engine rpm between 1,800 and 2,000 rpm will give the best fuel mileage and power because that is the rpm window where the Cummins 6.7-liter makes peak torque.
I tow at 60 with rpm's about 1,750. Just right! That's with 4.10's. At 70 I am about 2,000.
With my last DRW I had 3.42's. I would tow in 5th at same rpm's as above, just right!
Exactly right
I’ll expect to be getting the 3:31s in my next truck. Whether I’ll have to lock out 9th or tenth will depend on the load I’m pulling but with 1050 lb ft of torque most my loads will be considered light.
