2001 - 2005 Chevy GMC Duramax 6.6L Hypertech Speedometer Calibrator
Adjustable Features:
- Speedometer\Odometer Correction For Tire Sizes 24-34 inches 1/4 inch increments
- DTCs Read and Clear
- Return Back To Stock
- Internet Updateable
2006 - 2010 Chevy GMC Duramax 6.6L Hypertech Speedometer Calibrator
Adjustable Features:
- Speedometer\Odometer Correction For Gears 3.23, 3.42, 3.73 & 4.10
- Speedometer\Odometer Correction For Tire Sizes 26-36 inches 1/4 inch increments
- DTCs Read and Clear
- Return Back To Stock
- Internet Updateable
2011 - 2012 Chevy GMC Duramax 6.6L Hypertech Speedometer Calibrator
Adjustable Features:
- Speedometer\Odometer Correction For Tire Sizes 24-54 inches 1/4 inch increments
- Speedometer\Odometer Correction For Gears 2.56, 2.73, 3.08, 3.23, 3.42, 3.73, 4.10, 4.56, 4.88 & 5.13
- DTCs Read and Clear
- Return Back To Stock
- Internet Updateable
After installing tires that are larger or smaller than original equipment tires, or installing a ring and pinion gear set with a different rear gear ratio into your Chevy GMC 6.6L Duramax, the Speedometer Calibrator allows re-programming for correct speedometer and odometer readings, as well as correcting part-throttle shifting. As a result, the automatic transmission shift correctly and the speedometer readings will be accurate (as required by law).