you will have problems with virtually all other componenets of the truck before the Cummins will cause a problem , I have approx 400,000 miles on my Cummins & finally had to repair the original injection pump , yes it cost $2400 to fix but averaged out over 400,000 miles it is still cheap , the milage is always over 20 MPG . I would find a manual trans truck , the torque of the Cummins will kill the lock up converters in the autos , the front ends are the weak link in the Dodge Trucks from 94 to present other than that they are indestructable , I will never go back to gas