2003 Chevy 6.0 LQ4 Vortec Engine with 4L80E Trans and Wiring – LS Swap Dropout – 41K Miles

2003 Chevy 6.0L LQ4 Vortec Engine with 4L80E Transmission and Wiring – LS Swap Dropout – 41K Miles

This 2003 Chevrolet 6.0L LQ4 Vortec V8 engine and 4L80E automatic transmission package is designed for truck replacements and LS swap projects requiring strong V8 performance and a heavy-duty transmission platform.

The LQ4 is part of GM’s LS-based engine family and features an iron engine block suited to applications where durability and torque are important. The 4L80E is an electronically controlled four-speed automatic transmission with overdrive, commonly used in truck and performance applications. Included wiring can help simplify installation, depending on the harness and electronic components supplied.

Compatible Chevrolet Applications

• Silverado 2500HD and 3500
• Suburban 2500
• Express vans
• Compatible C/K truck projects
• Custom Chevrolet LS swap builds

Compatible GMC Applications

• Sierra 2500HD and 3500
• Yukon XL 2500
• Savana vans
• Compatible GMC C/K truck projects
• Custom Sierra and classic GMC builds

Popular Swap Applications

• Chevrolet C10 and square-body trucks
• GMC classic pickups
• Chevrolet and GMC performance trucks
• Classic muscle cars and restomods
• Street rods, hot rods, and custom builds
• Off-road and high-torque truck projects

Engine and Transmission Highlights

• Engine: 6.0L GM LQ4 Vortec V8
• Model year: 2003
• Mileage: Approximately 41,000 miles, as listed
• Transmission: 4L80E four-speed automatic with overdrive
• Wiring: Included; exact harness configuration should be confirmed
• Engine block: Cast iron
• Ideal for: Compatible replacements, LS swaps, and custom powertrain builds