Ford super duty 3.31 rear end. Will it be a big mistake. ?

I have the 3.31s in my f350 and pull a 14K 5th wheel. no problems at all, I guess if you need to do stop light racing with the 5th behind it you could go 3.55s haha.. seriously though most of my driving while towing is on the highway so it works great for me. what little city areas I do have to go through I just drive. still pulls harder than most cars...

Steve