I got all the way to 220,000 before i broke a injector hold down and shot the injector out of the motor:rof I could have fixed it and kept going but i decided to pull the motor and rebuild it. The engine, trans and drivetrain is new but the rest of the truck has 230,000 miles now.
My dads 2005 LLY Reg Cab ZF-6 has about 250,000miles. Just for some stupid reason the FLYWHEEL went out 2 times. Other than that there is nothing done to it. It is compleatly stock. He still gets about 24miles per gallon with it too... Mine only has 50,000miles