Eagle 2037005900B7 Forged 4340 Steel 3.700" Stroke Crankshaft 93-99 Mitsubishi

Vehicle Fitment

• 1993-1999 Mitsubishi Eclipse (GST/GSX, 2.0L Turbo 4G63)
• 1992-1999 Eagle Talon (TSi, 2.0L Turbo 4G63)
• 2003-2006 Mitsubishi Lancer Evolution VIII/IX (2.0L Turbo 4G63) - 7-bolt crank flange

Features

• Forged 4340 chromoly steel for superior strength and durability
• 3.700" (94 mm) stroke for performance stroker builds
• 7-bolt crankshaft flange compatible with Mitsubishi/Evo 4G63 platforms
• Internal balance design suitable for high-HP applications
• X-rayed, magnafluxed, and sonic tested for quality assurance
• Chamfered and narrowed main and rod journals for fatigue resistance
• Nitrided and micropolished journals for smoother bearing interface
• Designed for compatibility with 94 mm bore Mitsubishi 4G63 engines

Specifications

• Material: Forged 4340 steel
• Stroke: 3.700" (94 mm)
• Main journal diameter: 2.244"
• Rod journal diameter: 1.771"
• Balance type: Internal
• Minimum rod length: 5.900"
• Flywheel bolt pattern: 7-bolt flange
• Requires custom balancing with rods/pistons; chamfered/narrowed bearings required

Included Components

• 1x Eagle forged 4340 crankshaft (part 2037005900B7)

Product Description

The Eagle 2037005900B7 forged 4340 steel crankshaft is engineered for high-performance Mitsubishi 4G63 engines. With a 3.700" (94 mm) stroke, it increases displacement for turbocharged builds, making it ideal for racing and high-boost applications.

This crankshaft features advanced forging, X-ray, magnaflux, and sonic testing to ensure durability under extreme loads. Chamfered and narrowed journals enhance fatigue resistance, while nitriding and micropolishing improve bearing interface. This is a high-performance upgrade and requires custom balancing with the connecting rods and pistons.

Recommended for enthusiasts building high-boost 4G63 engines, including Mitsubishi Eclipse, Eagle Talon, and Lancer Evolution VIII/IX platforms. Fitment confirmed through 2006; 2007 onward is unconfirmed. Professional installation by a qualified engine builder is advised to ensure correct clearances and assembly.