Yup, that's how manufactures like to handle thing, just change the whole component, its not worth it to try and rebuild it. Ive been a tech for 10 years, often when I have to repair a small part like a starter by the time you look at parts and labor it would have been cheaper to replace it, and if its a warranty matter they tech usually has no choice, they have to follow procedure. Not to mention that most components these days aren't meant to be rebuilt, just used and replaced when its worn. HypocriteB seems to have very little understanding how anything works. Not to mention "old school" mechanics working on new common rail computer controlled components is often a bad combo.
And this brings us back to the OP the person said THAT HE NEVER!!!! abused the truck. Well maybe not!! but when the power box or mileage maker, is added and the original program has been changed to WHAT EVER. The parameters of the engine design have been altered, YES some can do it successfully SOME cant. Im a firm believer in LEAVE IT ALONE if you wanted the tire burning power BUY A BIGGER TRUCK, If you wanted a HIGH MILEAGE get something that gets mileage. Correct me if im wrong but the only thing that the BOXES can do is change FUEL DELIVERY AND TIMING? once changed and ran the DAMAGE if any is DONE and cant be removed by the stroke of a computer KEY.
I DONT KNOW FOR SURE? BUT I THINK CUMMINS KNOWS JUST A LITTLE MORE ABOUT THIS MOTOR THAN SOME WIZZ KID WITH A POCKET COMPUTER. if they would have wanted it that way THEY WOULD HAVE MADE IT THAT WAY.
As for the part about old school mechanics working on new technologies????? JMO but I would rather have an OLD SCHOOL mech work on my truck with common sense, than someone out of the BIG BOX MECHANIC SCHOOLS that THINK they know EVERYTHING because they have a diploma AND THE PAYED 30K TO GET IT, some of the best mechanics are the ones that cant read a Chilton's Book and sign their name with an X but know what end of the wrench to use.
BIG