<div data-store-description="v1"> <p>Transmission Harness for GMC Sierra Chevrolet Silverado 2003-2006. Supplied product details follow.</p> <h3>Specifications and fitment</h3> </div> <p>Includes: <br>- Transmission Wiring Harness</p> <p>Fits Models: <br>- Chevrolet Silverado <br>- GMC Sierra <br>- Hummer H1</p> <p>Model Years: <br>- 2003–2006</p> <p>Submodels: <br>- Common trims include WT (Work Truck), LT, LS, and HD (Heavy Duty) <br>- Chassis codes: GMT800 for Silverado and Sierra, and the H1 chassis</p> <p>Engine Options: <br>- Common engine sizes include 4.3L V6, 4.8L V8, 5.3L V8, 6.0L V8, and 6.6L Duramax Diesel <br>- Engine codes: L33, LM7, LQ4, LLY</p> <p>Description: <br>This Transmission Wiring Harness is designed for the Chevrolet Silverado, GMC Sierra, and Hummer H1 models from 2003 to 2006. It ensures proper electrical connections for the transmission system, facilitating optimal performance and reliability.</p> <p>Features: <br>- Direct fit for specified models and years <br>- Durable construction for long-lasting use <br>- Ensures proper transmission function and performance <br>- Easy installation with factory connectors <br>- Compatible with multiple engine options</p>