Mine has 3.55 rear and is rated to tow 9600# before I went with 33" BFG MS2's (one inch over the stock 32's). With my camper, 80 gal water, genny, and stuff, was about 8200#. My Eco pulled it up Daniels summit from Heber, cruise on, at the posted limit (65), at 2700 rpm. In the last 1/4 mile...