3.5 plus the 3.73 is the ideal combination for daily driving and towing. Plenty of power when towing on premium fuel (albeit at the expense of fuel mileage in the 8-10 range) and seldom if ever downshifts on the highway, even when towing. I tow at my max GVWR on the trailer when I tow, due to full water tanks most of the time, and 900lbs tongue weight, plus 2 adults, 2 teenagers and a tweenager plus paddle boards and firewood in the truck. I know I'm probably 300 pounds over payload rating but with my WDH set correctly and only doing it 10 times per summer, I'm ok with it. If you're planning on pulling a heavy RV full time with an expedition, get a different vehicle, but 90% of the time it's just a grocery getter.