LS9 Engine & Stage 6 4-Speed Automatic Transmission Package

LS9 engine power meets a heavy-duty computerized automatic transmission in this complete turnkey powertrain package. Built around the Chevrolet Performance LS9 6.2L supercharged V8, this combination delivers a factory-rated 638 horsepower and 604 lb-ft of torque, making it a compelling choice for classic restomods, pro-touring builds, high-end customs, and other performance applications.

The LS9 6.2L supercharged engine uses an Eaton 2.3L four-lobe Roots-type supercharger with 10.5 PSI of boost. The result is strong, immediate power in a complete LS9 supercharged engine package designed for buyers looking for a high-output LS powertrain rather than a basic crate engine.

Power is transferred through a Stage 6 heavy-duty computerized 4-speed automatic transmission paired with a precision billet Yank multi-disc performance torque converter. The upgraded transmission combines heavy-duty internal components, high-energy friction clutches, and a high-flow valve body for a performance-oriented automatic setup, while the billet converter is designed to provide strong launch performance and responsive throttle control.

For a more straightforward installation, the package includes a standalone ECU/TCU control system, plug-and-play engine and transmission wiring harnesses, and a pre-loaded powertrain tune. The calibration includes key settings such as shift points, shift firmness, and fuel mapping for the specified combination.

Key Specifications

• Engine: Gen IV LS-Series 6.2L Supercharged V8 (LS9)
• Horsepower: 638 HP @ 6,500 RPM
• Torque: 604 lb-ft @ 3,800 RPM
• Supercharger: Eaton 2.3L Four-Lobe Roots-Type
• Boost: 10.5 PSI
• Transmission: Stage 6 Heavy-Duty Computerized 4-Speed Automatic Overdrive
• Torque Converter: Billet Yank Performance Multi-Disc Converter
• Drivetrain Control: Standalone ECU/TCU with Pre-Loaded Powertrain Tune
• Wiring: Plug-and-Play Engine & Transmission Harnesses

Package Includes

• Complete assembled LS9 6.2L supercharged engine
• Eaton supercharger and dry-sump oil pan
• Stage 6 upgraded 4-speed automatic transmission
• Billet Yank performance torque converter
• Standalone programmable ECU/TCU control system
• Complete plug-and-play engine and transmission wiring harnesses
• Pre-loaded powertrain tune covering shift points, shift firmness, and fuel mapping
• Front Accessory Drive (FEAD)
• Alternator
• Water pump
• Ignition coils

Before ordering, verify engine-management requirements, accessory configuration, transmission fitment, driveshaft requirements, cooling system, fuel system, and physical clearance for your specific build.