I would pass on any truck with the 3.21 gears. Not enough mileage improvement for the loss of torque.
I think the 8 speed trans makes this a non issue. Just select 1 gear lower and it's virtually the same final drive ratios as the .392's
The 1st gear ratio is still lower than the old 6 speed with the higher gears.
We have 2 2015 ram 1500 quad cabs with the hemi engines in them. I'm currently at 27,000 miles, and the wife's truck is only at 17,000 miles ( it pays to live really close to work and lead extremely boring lives. We both love them and wouldn't change a thing.
I just pulled my friends 20 ft 1972 camp trailer (5500# )to Orofino and back for a steelhead/whitetail trip and we pulled whitebird hill at 55 MPH, I could have been going faster but I was quite happy keeping it at or above 3 miles per gallon on the ascent.
Just before we left I asked my buddy if the trailer brakes worked and he said he was told they did when he bought it. I reached down and tried the brakes and nothing nada zip.......I was quite worried about the downhill portions until Midvale hill, I just locked out everything higher than 5th gear, and the engine braking did almost all of the work. At one point I was slightly exceeding 60mph and used the brakes, but I could've done without,as I was nearly to the bottom by then.
The 8 speed trans makes all the difference in the world, I'd definitely look for one with it.And both of our trucks are bighorn packages. We have the heated seats, and steering wheel as well, it's great on the lower back after a lifetime of being a young stupid guy that thought he was invincible.