I gotta ask because it's one of the things I think about because i'm a weirdo. How did the 37's affect fuel mileage? Once thing I love about my '12 CTD MegaCab is getting over 600 miles between fueling. Mines deleted, tuned, 3.73's but running the stock 31.5" tires. I'm gonna need some new tires here before too long, and i'm debating between 33's and 35's.
Also, are you finding yourself feeling like you need lockers, or an LSD at any point? I literally had my first off road experience 8 days ago, and I found that the truck with open diffs front and back did quite well, but it wasn't so bad that it would have demonstrated any weaknesses the truck has. Until now, all my knowledge is from Youtube, and reading forums like this.
Thanks,
Branden
"Need" is a funny word. I have found I could have really used lockers only a couple times so far. Once in the snow, and once thinking a black diamond jeep trail was a good idea. I got through the jeep trail, but it wasn't easy or fun. I am in a 08' Megacab on 35s for reference. The rear LSD is pretty much garbage when it is needed. It works great when it is not.