@denverpilot You're starting to make me wonder if my truck didn't have 4.10s in it and I just didn't realize. Your RPMs are very similar to what mine were, and I had the same transmission. Well, it's been 10 years so I'd say it's pretty irrelevant at this point.
That or I've been lied to about what's in it. Ha. The sticker that's supposed to confirm under the hood is long gone and I've only looked at the rear end once for the stamps that should confirm it and couldn't find them. So I'm just going on the original order stuff on the window sticker that the original owner kept and what it said but it could be flat wrong. I'd have to do the math to prove it I guess.
I thought Dodge (Ram) stopped putting Cummins diesels in their new trucks and now use something from Fiat. Nissan is now where you have to go to get a Cummins.
That's for the little "cute" diesel in the half tons. The big deal diesel in the heavy duty trucks is still Cummins but they did switch from the 5.9L Cummins to the 6.7 in the half year in 2007.
Here's the full history in the Dodge... the continual increases in HP and torque are impressive. Dodge supposedly has kept up with beefing up the drivetrain to handle it, but they're not known for getting that right... LOL.
https://cumminsengines.com/pickup-truck-cummins-ram-history
Various aftermarket stuff can tune the 5.9 to output much higher HP and torque numbers at the expense of lifespan on the Bosch VP44 fuel pump (making it pump more fuel reduces cooling internally and they love to fail) and tearing up the drivetrain, starting with the clutch on a manual if you have the NV5600 transmission, and wearing out the 3rd and 6th gear in the transmission from completely overheating it.
There's "help" available for the trans both in the cooling (large covers with fins) and internally during rebuilds (drilling/machining better trans fluid galleys/ports for cooling the rear end of the transmission) but little help available for the VP44.
Exacerbating the VP44 heat problem is the common failure of the in-tank lift pump for fuel, and most folks get rid of the thing and add an aftermarket lift pump (Airdog is one brand) under the frame of the truck to attempt to "save" the VP44. Helps for a while but doesn't completely fix the design flaws of the Bosch pump. My Bosch failed around 125,000 miles with an AirDog feeding it.
Even Cummins did a slight tune early on to the 5.9 and you could order it in regular or "HO" (high output) which was a very marginal increase in HP and torque and was available stock from Dodge as a factory order. My truck started life as an HO, and right now with the electrical connections from the aftermarket computer disconnected from the VP44, that's where it sits today.
During the VP44 change the dealer that did it refused to reconnect the aftermarket computer -- of course -- but it's still operational as a series of gauges with all the add-on sensors it uses, like a pyrometer and transmission temp sensor that otherwise aren't on the stock trucks at all... I have plenty of power in this configuration but I'd like to reconnect it to get "towing" mode back which overfuels a bit (cooling) and adds about 100 HP and 50-75 ft lbs of torque, but really it's not necessary with the upsized turbo and bigger injectors. (It didn't have the bigger injectors when I bought it but while the head was off after the head gasket blowout, it was a fine time to put 5 more horsepower upsized injectors into it. And stud it.
And a new exhaust manifold that flows better and moves the turbo to a better location under the hood. And a huge air intake filter and sock similar to what one would see in farm duty, no more tiny Dodge airbox... and it already had an upgraded 4" tip to tail exhaust system with 5" outlet at the back...
It scoots pretty good without the computer. With the computer reconnected in any of the performance modes above Towing Mode, I'd just be wearing out the clutch and u-joints faster, especially if I made a bad shift and got in it too hard before everything was stable... I'd just be tearing out the drivetrain.
The computer also has an "economy" mode that modifies timing of the Bosch a little and reduces fuel flow, which paired with the larger injectors would probably end up nearly "stock".
So one of these days I'll hook it back up but use it sparingly. There are some newer smarter computers on the market that manage timing and injection pulse length a lot more accurately (and based on better long term data) than my "dumb" 90's vintage one. (It's an Edge "with Attitude" brand, but so old they don't even sell it anymore.)