Gears ain't gonna do it, cuz my 97 Dakota 4x2(318/44RE) does this too, with 27" tires, and 3.92 gears. Runs along in OD fine, pulling a 3500 lb trailer, then on a hill, under 2300 RPM, it loses oomph. Push throttle further, downshift/unlock, then lockup, and o... Login to read more.