Speedometer Calibrator | Chevy/GMC 2500HD/3500HD (24-26)

Speedometer Calibrator for Chevy/GMC 2500HD/3500HD (24-26)

Complete the final touch on your lifted rig with Rough Country’s Speedometer Calibration Device. Built for ease of use, this plug‑and‑play module quickly recalibrates your speedometer so readings stay accurate after upgrading to larger tires.

When you swap to bigger tires, your vehicle’s computer is tuned for stock sizes, which can throw off speed readings. This device eliminates those discrepancies and restores precision, so you can trust your speedometer again.

• Plug‑and‑play installation: Connects directly to your vehicle’s TCM and BCM—no complicated setup or tools required. Calibration can be completed in just a few hours.
• ECM optimization for larger tires: Beyond adjusting the speedometer, it updates the ECM to accommodate bigger tire sizes, ensuring accurate shift points and recalibrating the electronic stability control (ESC) for safe, smooth driving.
• Easy return to stock settings: Need to revert before servicing or selling? A simple option resets your speedometer back to factory values.
• 1‑year warranty: Complete peace of mind with reliable performance backed by a solid warranty.

Compatible with Chevy/GMC 2500HD/3500HD (24‑26).