Fits: 2001 thru 2005 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY Duramax Diesel 

Easily adjust your speedometer for non-stock tires or gear ratios with the Hypertech Speedometer Calibrator. A user-friendly on-screen menu streamlines the process, reprogramming your vehicle's computer for precise readings in just minutes.

Features:

• Speedometer Correction For Tire Sizes 24-34 inches 1/4 inch increments
• Return Back To Factory Settings
• DTCs Read and Clear
• Internet Updateable

Includes: 

• Hypertech speedometer calibrator

Notes: 

• Carb E.O. D-260-22