I have a 2011 4x4 Yukon SLT, 5.3L, 6 Spd, 3.42 Rear Axle, 2 Spd Transfer case, with HD Tow Package (oil cooler, HD trans cooler, increased fans/radiator, trailer brake controller) and skid plates, etc. I have used a Range AFM disabler module for the last 3 years or so. I'm the original owner...