C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Wheels: All Technical Service Bulletins
A/T - Tire/Wheel Size Inspection Prior to Diagnosis
File In Section: 03 - Suspension
Bulletin No.: 01-03-010A
Date: September, 2002
INFORMATION
Subject:
Inspection of Tire and Wheel Size Prior to Diagnosis of Transmission Shifts, Poor Performance, Speedometer, Cruise Control Concerns
Models:
2001-2002 Chevrolet Silverado Pickup Models
2001-2002 GMC Sierra Pickup Models with Duramax(TM) Diesel Engine and Allison(R) Transmission
This bulletin is being revised to correct tire information for the 2500 series trucks. Please discard Corporate Bulletin Number 01-03-10-010 (Section 03 -
Suspension)
Proper diagnosis of engine, transmission, speedometer, and cruise control concerns must begin with an inspection of tire/wheel size.
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The 2500 series trucks have LT245/75R16E tires as standard equipment.
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The 3500 series trucks have LT215/85R16D tires as standard equipment.
A truck that has different tires and wheels will have Engine power/performance concerns, Transmission shift concerns, Speedometer registered speed
concerns, and Cruise Control concerns.
Before any diagnosis is performed for these types of concerns, inspect the tires/wheels for the proper tire and wheel combinations.
If a truck is found to have other than the above listed tire sizes, no further diagnosis should be undertaken until the original size tires and wheels are
reinstalled on the truck.
The Engine Control Unit (ECM) and Transmission Control Module (TCM) use (RPM) and (VSS) inputs as operational parameters for engine torque,
transmission shifting, cruise control operation and speedometer indicated vehicle speed.
Calibrations for different tire/wheel combinations are not available.
Therefore changing of tire and/or wheel size should not be undertaken by dealerships or truck owners.
Warranty Information
Reinstalling the proper wheels and tires on the vehicle, prior to performing any type of diagnosis of the truck, would be considered truck owner
responsibility and not a warranty repair.
DISCLAIMER
