It took me a while to find the reference, but the thermal axle is only offered on 4x2 trucks WITHOUT the towing package. Pickuptrucks.com wrote: “Right now, the system is only offered on the smaller (9.25 inches) non-tow-package axle.”I will let them explain it this time
http://fcauthority.com/2018/01/2019...er-thermal-management-tech-feature-spotlight/