I have a '16 Ram 2500 CTD that I love except towing. I wish it had the 3.73 rearend instead of the 3.42. What is your rpm at 7o mph in 5th and 6th gears ?
My 11 HO DRW had 3.42's and I loved them. ONLY issue was getting the load rolling on a steep grade with the 68RFE. AISIN cures that issue. I was only towing a combined 29k.
I towed in 5th at 1,750rpm at 60. SAME rpm as my current DRW with 4.10's at 60. PERFECT rpm's.
IMHO 3.73's are the bastard gearing in the 4th gen trucks.