1997–2006 LS/Vortec DBC Standalone Wiring Harness

For 4.8L, 5.3L & 6.0L Engines with T56, TH400, TH350, 700R4 or 200-4R Transmissions

Complete standalone engine wiring harness designed for Gen III GM LS/Vortec engine swaps using a drive-by-cable throttle body. This harness provides a clean, organized solution for installing a compatible 4.8L, 5.3L, or 6.0L engine with a T56 manual transmission or a non-electronically controlled automatic transmission.

Compatible Engines

• Gen III GM LS/Vortec 4.8L, 5.3L and 6.0L engines

• Designed for drive-by-cable throttle systems

• Compatible with EV1-style fuel injector connectors

• Intended for compatible 1997–2006 engine applications

Compatible Transmissions

• T56 manual

• TH400

• TH350

• 700R4

• 200-4R

This harness is intended for applications that do not require electronic automatic-transmission control.

Product Features

• Standalone, plug-and-play engine wiring design

• GM-style color-coded wiring for easier identification and installation

• Simplified four-wire power and ground hookup

• Requires switched power, constant battery power and ground connections

• Adjustable firewall grommet helps provide a clean, sealed installation

• High-quality copper-core wiring for reliable electrical conductivity

• Durable, corrosion-resistant and wear-resistant construction

• Reinforced ring terminals for dependable power and ground connections

• Manufactured using quality components designed to meet or exceed original-equipment standards

• Ideal for LS swaps, custom builds, restorations and performance applications

Important Fitment Information

Please verify your engine year, throttle-body type, injector connector style, PCM compatibility and transmission configuration before ordering. This harness is designed for drive-by-cable applications and is not intended for drive-by-wire throttle systems or electronically controlled automatic transmissions.

Professional installation is recommended.