So....(comparing here) I'm on the road with a 1989 Marathon , Ford E-350, 7.5 Liter V8 (460CID), 4sp OD tranny with 3:73 Diff gears. My "dingy"..is a 2010 Wrangler Sport (5,600GVW). On "steep" uphills/downhill roads, I, 1) 4 way flasher "On" every time. 2) Maintain tranny in 2nd gear at an...