Cummins 5.9 325hp/610tq
I have a 06 quadcab bighorn edition with the 5.9/48re tranny. I bought it new and didnt touch anything till 99,xxx. Was the rear driveshaft u-joint, had minor vibration over 70mph. I had to replace tranny cooler(130,xxx) that had a small leak,$225. At 180,xxx tranny started to sliip, had local tranny shop rebuild with triple disc torque converter, installed a shift kit and extra deep tranny pan. Got it back and couldn't beleive how nice it shifted and how it pulled. Wish it would have gave me issues earlier. I replaced upper and lower ball joints for the first time at 188,xxx. It is on its 6th set of tires, 2nd set of brakes and just over 200,000 it runs great. I pull 5-7,000 daily and pull 16,000 2-5 times a month. Mileage has been 17-20 winter and 18-22 summer empty. pulling is 10-15 at 2,000 rpm. Mileage seems to fall off if you run over 2,000. GOOD LUCK