Speedometer Calibrator | Chevy/GMC 1500/2500HD 2WD/4WD

Finish or upgrade your Chevy or GMC with Rough Country’s Speedometer Calibration Device—the plug‑and‑play solution for recalibrating your speedometer when you run larger tires. Designed for Chevy/GMC 1500 and 2500HD models in both 2WD and 4WD, it keeps your readings accurate and your vehicle’s systems in sync.

• Compatibility: Designed for Chevy/GMC 1500 and 2500HD trucks in 2WD and 4WD configurations.
• Plug-and-Play Installation: Connects directly to the Diagnostic Link Connector Port for a quick setup with minimal steps.
• Speedometer and ECM Calibration: Reprograms the speedometer and updates the engine control module to align speed readout with larger tires, preserving shift points and electronic stability control.
• Larger Tire Size Calibration: Accurately reflects your true speed and odometer readings after upgrading tire size.
• Reset to Stock: Built-in function to revert to stock calibration before servicing or reinstalling stock tires.
• Warranty: Includes a 1‑Year Warranty from Rough Country.

This calibrated setup reduces the risk of inaccurate speed readings, which can affect speed enforcement, trip data, and performance software. With true speed readouts, you’ll experience proper shift timing, consistent throttle response, and reliable stability control—essential for lifted trucks that run bigger tires. The reset feature makes maintenance effortless, and the compact, straightforward design means you can complete the process in minutes without specialized tools.