Downshifting- I think you hit on this Adam. I know some people donβt like it, personally, I love it. I believe the truck runs more efficient at higher RPMβs. All trucks. More fluid flowing to parts likes transmissions, more oil flowing through the cooler. Generally your fan kicks on when it downshifts. All things to help your truck in the long run.
Less stress on your drivetrain if it downshifts under power on a hill or passing.
Understanding your truck and how it likes to run is key when towing. If I know a hill is coming, I prefer to make it downshifts before I even get to the hill and let the truck pull me over the top. Kinda like driving a big rig, pick a gear before the hill and stick with it.
Maybe Iβm wrong, but Iβd challenge anyone to prove me wrong. I bring this up because I was just talking to guy about this this morning as heβs looking at a new truck. He was bragging about how he likes the lugging power his 5.9 Cummins has. Of all trucks, a Cummins is not one you should lug. Those transmissions do NOT like heat!
I used to tow a lot with a 5.7 hemi in the mountains of AK. Totally different animal when you are pulling grade for 5+ minutes. Iβd downshift that truck to third or fourth gear and power up the hills pushing 4,500-5,000 rpms. Right in the middle of the powerband. Never once had an issue. Just because the motor is singing, doesnβt mean you are hurting anything.
Whatβs the powerband on that new 6.6? I think youβll be happy with it once you get over the fact that it just isnβt a diesel and you need to work it different.