50,000 each on our twin 2001. 5 3500's. 410, six speeds, with only 275 injector mods, used only for pulling. very good, we've had the exhaust man bolt problem, and one truck has lost an ac condensor. other than that, they have performed flawlessly. i always thought that one of these two trucks, would be a dog, proving my less inteligent buyers to keep pushing for ford and chevy. well our "old trucks" now have to compete with the new boys, who should i bet dinner on?..... 
