2003 Chevy Silverado 5.3L L59 Iron Block V8 Engine & 4×4 4L60E Automatic Transmission Complete Dropout Swap (Under 14,000 Miles)

2003 Chevy Silverado 5.3L L59 Iron Block V8 Engine & 4×4 4L60E Automatic Transmission Complete Dropout Swap (Under 14,000 Miles)

Looking for a time-capsule, ultra-low-mileage factory replacement or a bulletproof 4×4 swap foundation? This premium 2003 Chevy Silverado 5.3L Vortec L59 V8 engine and 4×4 4L60E automatic transmission complete pullout package is an absolute unicorn find.

With less than 14,000 original miles, this complete engine and transmission dropout represents an incredibly rare opportunity to source a factory-fresh Gen III small block. The L59 platform is highly sought after by enthusiasts and truck owners across the American and Australian markets for its heavy-duty cast-iron block structural integrity and its factory-engineered Flex-Fuel capabilities.

Technical Specifications & Features

GM 5.3L Vortec L59 V8 Engine

• Engine Family: Gen III LS-Based Small Block (VIN Code “Z”)

• Displacement: 5.3 Liters / 325 c.i.d.

• Block Material: Heavy-Duty Cast Iron for unmatched structural stability, making it highly resilient under heavy towing, extreme off-roading, or forced induction (turbo/supercharger) applications.

• Cylinder Heads: High-Flow Aluminum Cathedral Port (typically featuring casting #862 or #706), engineered for exceptional low-end torque and high intake velocity.

• Fuel System: Factory Flex-Fuel capability (robust fuel injectors and composition sensor designed to run seamlessly on standard unleaded pump gas, E85 ethanol, or any blend of the two).

• Factory Performance Ratings: ~285–290 Horsepower / 325–335 lb-ft of Torque.

• Reluctor Wheel: 24X.

4L60E 4-Speed Automatic Transmission

• Configuration: 4×4 / Four-Wheel Drive heavy-duty application.

• Drivetrain Compatibility: Integrated and ready to mate to your matching 4WD transfer case.

• Performance: Features optimized hydraulic shifting logic and a robust overdrive gear to deliver comfortable, low-RPM highway cruising without sacrificing off-the-line pulling power.

Why Choose this L59 Gen III Pullout Package?

• Legendary Mechanical Simplicity: Because this is a 2003 Gen III engine, it features a traditional, reliable pushrod layout that is completely free from complex Variable Valve Timing (VVT) or modern Active Fuel Management (AFM / Displacement on Demand) components. You entirely avoid the notorious lifter failure issues common to newer truck engines.

• Unrivaled Low Mileage Condition: Finding a genuine, verified Gen III iron block engine with under 14k miles is virtually unheard of today. All internal tolerances, seals, and mechanical interfaces are in factory-fresh condition.

• Turn-Key Cohesion: This package is pulled as a highly complete engine and transmission assembly, minimizing your installation downtime and eliminating the massive hidden costs of hunting down mismatched ancillary electronics.

What’s Included & Logistics

This entire package has been strictly multi-point inspected, cylinder compression tested, and run-verified to ensure pristine operational condition.

Package Includes: Complete 5.3L L59 iron block engine assembly (oil pan to intake manifold), individual coil-near-plug ignition packs, spark plug wires, factory exhaust manifolds, complete engine wiring harness, and the matching 4×4 4L60E automatic transmission with torque converter safely seated.

This premium 4×4 powertrain dropout is securely palletized, wrapped, and ready for fully insured freight transport across the United States, as well as direct containerized ocean freight to all major Australian ports. Contact us with your zip or postal code today for a fast, competitive shipping quote!

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