I got a 2021 3500 DRW; it comes with the 4:10 gear set and Aisin.

My old truck was a 2017 2500 G56 with a 3:42 gear set.

I'm thinking about putting 3:42 in my new truck, and I do tow semi-regularly a 16000 lbs fifth wheel toy hauler.

My 2017 didn't have a problem towing it and got almost 20 mpg when not towing, so I've been tossing around the idea of switching.

Has anyone changed out their gears similar to this, and how do you like it?