Well, the PW has 2" more suspension and another ~2 of tire. That's a lot of drag regardless the gears. That also translates to gear searching with bigger tires or pulling a load.
You can subscribe me to the theory of these trucks needing deeper gears. The transmission gearing is right for a Cummins, but it's all wrong for a gas burner. That's why the 6.0L GM always seems to do better in towing challenges on TFL Truck etc. You're looking a a transmission that's suited to a gas burner. 4.03 Vs. 32.23 for the first gear is a significant difference. With 4.10 ring gear in the ram you get. 13.24:1 and with 3.73 ring gear in a GM you get 15.03:1. So you need 4.65xxxxxx to make the 3.23 work as well.
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