Recently purchased a 2001 crew cab 4x4 with the 4.7 auto. It does not have a tow package. I suspect that the main difference with the tow package is engine and transmission cooling. Can anyone verify. I would like to increase towing capacity to that of a tow package. I assume suspension is the same. I will get the proper hitch and wiring. I would also get an auxiliary transmission cooler and some type of transmission temperature reading. My truck doesn't have a tow/haul mode. Does a tow package model have that? It does have the ability to select overdrive on/off.