Eagle 2039375900B7 Forged 4340 100 mm Stroker Crankshaft for 1993-06 Mitsubishi

Vehicle Fitment

• 1993-2006 Mitsubishi / Eagle Talon / Eclipse / Lancer Evolution (4G63, 7-Bolt, Internal Balance)

Fitment Notes

• Requires narrow rod & main bearings due to .125" fillet radius on journals
• Flywheel bolt pattern: 7-bolt rear flange
• Not compatible with 4G63 non-7-bolt crank housings without modification

Features

• Forged 4340 steel construction for high strength and durability 
• Non-twist forging, stress-relieved, shot-peened and nitrided finishing to resist fatigue 
• Oil holes are chamfered for improved lubrication flow 
• Rod and main journals polished (micropolished) to a fine surface finish for better wear characteristics 
• Large fillet radius (0.125") on rod & main journals to increase strength against stress risers 
• Balanced internally for smoother operation at high RPMs 
• Rated for very high horsepower applications (often up to or exceeding ~1000 hp with proper supporting components) 
• Designed for a 7-bolt rear flange typical on 4G63 "Evo/Talon/Eclipse" engines, enabling direct fitment with matching housings 

Specifications

• Stroke: 3.937" (100 mm) 
• Main journal diameter: 2.244" (≈ 56.998 mm) 
• Rod journal diameter: 1.771" (≈ 45 mm) 
• Rod journal width: 1.05" 
• Flywheel bolt count: 7 (rear flange)
• Engine balance: Internal 
• Requires narrow bearings / chamfered bearings due to fillet radius 
• Typical weight: approx. 34 lbs (≈ 15.4 kg) without balancing or additional components 

Included Components

• 1x Eagle 2039375900B7 forged 4340 crankshaft

Product Description

This Eagle 2039375900B7 crankshaft is designed for performance builds using the Mitsubishi 4G63 engine with a 7-bolt rear flange. With a 100 mm (3.937") stroke, it functions as a stroker crank when paired with proper pistons and rods, increasing displacement and torque output. The forged 4340 steel, combined with non-twist forging, shot peening, and a large fillet radius, provides excellent resistance to fatigue, ideal for high RPM and high load applications. The internal balance design simplifies setup in vehicles using the matching 4G63 housings and drivetrain components.

When installing this crankshaft, you'll need matching 7-bolt flywheel and rear flange, narrow main and rod bearings due to the .125 inch fillet, and you should ensure correct balancing for the rotating assembly (rods + pistons) to avoid vibration. This part has confirmed fitment for **1993-2006** models of Mitsubishi/Eagle Talon, Mitsubishi Eclipse, and Mitsubishi Lancer Evolution with the 4G63 7-Bolt crank setup. Fitment through **2006 confirmed**. **2025 unconfirmed** for this specific crankshaft.