Tachdriver wrote:
Back to your original question and adding that you will be towing a 6000 pound TT, I just traded in a 1996 C1500 with a 5.7L and 3.42 rear. I pull the trailer in my sig (6100 pounds) and with only 3 speeds to work with, it lugged off the line.
My new to me truck has max tow package, 3.73 rears and ecoboost it tows this trailer like it belongs here. There is a lot of good information above this post, however FWIW the newer EBs come with 3.55 or 3.31 you should be fine with either. The transmissions give you a wide variety of operating RPMs.
Don't know if this helps but I wanted to cut to the chase.
Thanks, we are really fortunate to have the newer transmissions with more gears.