Howdy, the combination you have should be fine. The 2008 has more HP and torque than my rig. I improved the intake / exhaust on my truck and it pulls even better now. The only caveat to this is the GVWR for the combo. My combo maxes out at 23k#'s, I have only scaled it once when we were loaded for bear, so to speak, and we were 800#'s over max. Another thing to consider is proper licensing. In Calif you need a non-comercial class A for the 3600, as it is over the 15K# GVW. I am not sure what UT requires. The 3600 is a monster, but once you get used to it, it pulls well and camps nicely. Make sure you check the lug nut torque religiously the first 500 miles..................Roger