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03-07 LS VORTEC STANDALONE WIRING HARNESS DRIVE BY WIRE W/4L80E 4.8 5.3 6.0 EV6
This has the adapter 4L80E that plugs into the 4L60E harness and you will have to pin 2 wires to the blue retainer. Comes with instructions.
FREE ADAPTER Connectors TO CONVERT HarnessTO EV6 Injectors IF NEEDED. No one else includes the connectors. Please put in the buyers notes if you need Ev6 connectors. If you forget we have to charge $12.95 later for shipping and handling
Take the wiring headaches out of your LS swap and get your build moving.
When you’re swapping a 2003–2007 LS Vortec drivetrain into an older muscle car, street rod, or non-emissions-controlled project, messy wiring can slow everything down. The HPI 03–07 LS Vortec Standalone Drive-By-Wire Wiring Harness for 4L80E is built to simplify the install with a standalone setup designed for 4.8L, 5.3L, and 6.0L truck engines using drive-by-wire. It includes the 4L80E adapter that plugs into the 4L60E harness and comes with instructions for the two-wire pinning step noted on the live page.
BUILT FOR REAL LS SWAPS
This harness is listed for 2003–2007 Chevrolet, GMC, Cadillac, and Hummer truck engines and is intended for retrofit use in older muscle cars, street rods, and newer non-emissions-controlled vehicles. It is built to work with the factory Vortec intake manifold and Multec injectors, while also offering optional EV6 plug-and-play adapter connectors if needed.
4L80E READY
Unlike generic swap harnesses, this setup is specifically sold with a 4L80E adapter for applications using that transmission. HPI notes that the adapter plugs into the 4L60E harness and requires pinning two wires to the blue retainer, with instructions included. That makes it a practical option for builders who need 4L80E compatibility without piecing parts together on their own.
CLEANER INSTALL. LESS GUESSWORK.
The harness is described as a complete engine and transmission harness with a four-wire hookup, requiring switched power, constant power, and ground connections. It also includes the needed dash connections for speedometer, tachometer, park neutral, TCC, malfunction indicator, and a DLC port, helping you finish the swap with a cleaner, more complete install.
BUILT TO HOLD UP
HPI states these harnesses are professionally constructed using brand new GM Delphi connectors and TXL high-temperature wire to GM specifications. The harness also features a sliding grommet seal for a professional, leak-resistant installation and added length for PCM mounting under the dash, with the page referencing both 4–5 feet of length from the rear of the cylinder head and 36 inches added for easy computer mounting.
MADE FOR PERFORMANCE BUILDS
Additional features listed on the page include GM color codes, high-quality reinforced ring terminals, 1200-degree fiberglass braid on heat-exposed circuits, factory CPA locks, upgraded wire for large injectors, upgraded 60-amp relays, quality inspection before shipment, and U.S.A. assembly.
WHY HPI
At HPI, swap parts should do more than just connect. They should install clean, fit right, and hold up when the build gets serious. This harness is built for enthusiasts who want less wiring drama and more time getting the project fired up.
Features:
- Designed for 2003–2007 LS Vortec drive-by-wire swaps
- Fits 4.8L, 5.3L, and 6.0L truck engine applications
- Built for 4L80E transmission use
- Includes 4L80E adapter
- Complete engine and transmission harness
- Supports factory Vortec intake manifold
- Supports Multec injectors
- Optional EV6 plug-and-play injector adapters available by request
- Four-wire hookup standalone configuration
- Dash connections included
- Brand new GM Delphi connectors
- TXL high-temperature wire to GM specifications
- Sliding grommet seal for cleaner installation
- Added PCM mounting length
- Upgraded wire for large injectors
- Upgraded 60-amp relays
- 1200-degree fiberglass braid on heat-exposed circuits
- GM color codes
- Reinforced ring terminals
- Factory CPA locks
- Instruction packet included
- Quality inspected before shipping
- Handmade in the U.S.A.
Fitment:
- 2003–2007 Chevrolet / GMC / Cadillac / Hummer truck LS Vortec engines
- 4.8L / 5.3L / 6.0L
- Drive-by-wire applications only
- 4L80E transmission setups
- Older muscle cars, street rods, and newer non-emissions-controlled vehicles
What’s Included:
- Complete engine and transmission harness
- 4L80E adapter
- Install instruction manual
- Needed dash connections including speedometer, tachometer, park neutral, TCC, malfunction indicator, and DLC port
Price: $239.00
Get your LS swap wired with a harness built to simplify the install, support your 4L80E setup, and keep your build moving forward with confidence.
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⚠️ WARNING (California Proposition 65):This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.For more information, please visit www.P65Warnings.ca.gov.
