Fantastic truck!
I bought my Sierra 2500HD 4x4 new in 2004. I have worked this truck(some would say overworked) for 344,000 miles with NO major component failures. I do take care of this truck with regular maintenance, using Rotella oil, and Lucas in every tankful of fuel. No injector issues, no problems with the Allison transmission, or any major components.
I tow heavy loads, and drive some rough terrain. I do not treat is badly, and It gets me there and back, AND fits my butt.
I have been offered good money and great trade deals for it. I will go for 500,000 miles.
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