This information is in addition to the "Tires" portion located in Section 5 of your owner's manual.
When tires are changed from the original equipment size to those adapted to Military Vehicle usage, the Engine Control Module (ECM) must be reprogrammed to correct the speedometer reading.
This reprogramming will also limit maximum vehicle speed to 93 mph (150 km/h).
Truck Models K 2500: LLY/LBZ/LMM 6.6 L V8 Diesel Engine and MW7 Automatic Transmission.Reprogramming the ECM is done with a TECH II electronic diagnostic system. Your GM truck dealer has this equipment. Your dealer has the correct calibration identified by the calibration part numbers on the following chart and any later updates after this publication.
Model Year | Engine | Transmission | New Tire Size | *Calibration P/N |
|---|---|---|---|---|
2003/2004 | LB7 | M74 | LT285/75R16 (628 Rev/Mile) (389 Rev per Kilometer) | 15130245 |
2004 | LLY | M74 | LT285/75R16 (628 Rev/Mile) (389 Rev per Kilometer) | 15130246 |
2005 | LLY | M74 | LT285/75R16 (628 Rev/Mile) (389 Rev per Kilometer) | 15130247 |
2006 | LLY/LBZ | MW7 | LT285/75R16 (628 Rev/Mile) (389 Rev per Kilometer) | 12607315 |
2007 | LBZ/LMM | MW7 | LT285/75R16 (628 Rev/Mile) (389 Rev per Kilometer) | 12607316 |
Please refer to the light duty series GM BODY BUILDER BOOK for further general information regarding vehicle modification. | ||||
*New calibrations include maximum vehicle speed of 93 mph (150 km/h).
