3.42 or 4.10?
I am going to place my order for a 2013 Ram 3500 DRW Crew Cab Diesel tomorrow.......3.42 or 4.10 rear end? Putting a 1140 Arctic Fox on the back, towing a 5,000 lb boat or Toyota Tacoma from time to ...
Forum Discussion
My calculations show that with a 3:42 gear at 75 mph and high gear with an Aisin transmission I would turn about 1772 rpm. It was stated this is the sweat spot of the Cummins. Now for heavy towing at 65 mph and 5 th gear I get 1877 rpm. 6th gear would be 1535. I am sure a cummins will do just fine even with a towing load at 1535 rpm on level road where 95% of most towing is done.
Now for towing heavy in hilly country it may require using the gears in the Aisin. But that is what I thought a transmission was for. That is what the big rigs do when they come to a hill with large heavy loads.
If you look at the torque/hp curves of the 6.7 high output cummins you will see it was designed to operate at lower rpm's than the previous versions of the cummins. The 850 foot lbs of torque that is advertized so much is at 1600 rpm. That should be the sweat spot for the new high output cummins.
Now for towing heavy in hilly country it may require using the gears in the Aisin. But that is what I thought a transmission was for. That is what the big rigs do when they come to a hill with large heavy loads.
If you look at the torque/hp curves of the 6.7 high output cummins you will see it was designed to operate at lower rpm's than the previous versions of the cummins. The 850 foot lbs of torque that is advertized so much is at 1600 rpm. That should be the sweat spot for the new high output cummins.
