He probly has 4.88 gears too...I would give anything to run 70 at 1850rpms. Maybe with the Gear Vendor but that's $5000 I don't have.i have a auto which is 6gears (07.5 and up) , i put it in tow haul mode and let it work its self. with 3.73 gears and 19.5 rims on a 285 tire pulling my trailer fully loaded i can cruise at 70mph around 1750/1850rpms . i has no problem pulling it at all . kodick's 08 5500 runs 2100 rmp or 2200 at 65mph when fully loaded in tow haul mode ( i beleive, j correct me if im wrong) and hes also running same rim and tire combo but has the aisin tranny.