How much does a 2005 mack dump truck cost?

New, $110k and up. Used? Depends. The overall value of a vehicle will depend on the make, model, options, overall condition, mileage, and engine hours. In 2005, the full size CH/CL/CV trucks were good trucks... the Granite series which replaced the R-model in production, not so much. If you're looking at a Granite, might want to reconsider.