Cummins lists this figure as 1800-1950RPM.
It'll run up to 3000RPM if manually shifted. The narrow RPM band has not been a problem, and seems ideally suited to the gearing (3.55 rear axle ratio) and travel at about 70MPH, which turns 1850-1900RPM on the engine while in OD.
Max torque runs at 420ftlbs stock, from about 1200-2800RPM. No load redline is 3400RPM or so, while loaded the PCM cuts it back to 3200 or so. Having not needed to push it, I'm not as familiar with these figures as I am on my gasoline powered vehicles.
I run an automatic trans, since the 6spd was back ordered when the truck was ordered. I have never had a situation where I let automatic shifting occur where it revved out farther than 2800RPM. This truck doesn't lack for power at low RPM, and pulls well in all gears. Towing at highway speeds in OD is easily done. If I manually shift while towing, I usually use 2100RPM or so, since I'm not interested in acceleration at that point. I manually shift prinicipally to hold gears longer than the PCM would via APPS readings. Thus I can use part throttle and hold gear, since the PCM wants MPG, not power. The PCM tries to upshift since the truck easily rolls most loads and looks to upshift ASAP.
Under hard acceleration while empty, it'll rev to 2800 automatically, while throwing the truck so hard the occupants are snugged into the seats. Do not mistake this for being pinned as one might be in a sports car. However, for moving 7000lbs, it is significant force.
-- Max
Built like a Mercedes 3694Tossing an educated guess, I'd put myself about mid range. A quarter the pickups in this town do get babied to one degree or another, another 25-40% get used...
"There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author)
