I ran 37’s with 3.92s and the 6 speed trans. That was couple of years ago. The Hemi has power to move them but she won't feel as peppy as moving 33's, 35's are still ok, but you might feel the sluggishness of the 37's for sure with 3.92's if you had the 6 speed trans. If you have the 8 speed trans it should be better. I put 12k miles on the 37's before i went back to 35's. Back then the truck was my DD and i was doing a lot of city driving, so MPG really sucked for me at 9-10mpg (city only), and gas was only $3 and change. (I live in Socal). I can only imagine the crap i'd have eaten when gas went up to $6 almost $7 around here with 37's
I've been more than happy with the 35's since gas is still $5 and change and i get 12-13mpg with those in the city, plus i get better performance and better braking power. 37's do look cool for sure, and if you're offroading the clerance is nice to have. That's why i'm staying with 35's. 33's won't cut for me.