Hypertech 732004 Speedometer Calibrator Programmer for 2007-2010 (New Body Style) GM Gas 2005-2006 Trailblazer SS/SSr 6.0L Reads and clears Diagnostic Trouble Codes (DTC's) Corrects the speedometer and odometer for tires up to 54 inches Downloads and saves the stock tuning program SAE certified guarantees reliability Easily accessible