For the life of me, I cannot figure out why there is such a big difference. Example: my 2000 Ranger 4.0 FWD, 4.10:1 rear end, manual tranny has a GVWR of 7000 lbs, but (according to my owners manual) if I would have gotten an automatic, with all other spec the same, the GVWR is 9500 lbs. Can...