Once again, my statements clearly indicate that the MaxTow comes with 3.73's
Also, you clearly stated that the HD is the "lesser of the packages". That's not the case. It is basically an upgraded MaxTow.
I did find the fleet doc you are referring to in your last image. I wrongly assumed that since the HD package CLEARLY indicates "9.75 gear set" non HD's would have something different. Not sure why it's listed as an upgrade in that package when it isn't????
As far as my comment about the springs. I have compared my spring codes from my door jamb (145" SCrew, 4x4, 20" wheels) to a MaxTow SCrew and the codes were identical. UUGG, if I remember correctly. Another truck identical to mine except for 18" wheels had UUAA, if I remember correctly.
If you analyze your doc closely, you'll see that the FAWR doesn't change on any truck, regardless of MaxTow or HD package. The only change is when going from 145" to 157".