Circle D Ford 258mm Pro Series 4R100/E4OD Torque Converter

Circle D Specialties Ford 258mm Pro Series 4R100/E4OD Torque Converter

The Circle D Specialties Ford 258mm Pro Series 4R100/E4OD Torque Converter is a highly versatile, high-performance upgrade for enthusiasts running a heavy-duty Ford 4R100 or E4OD transmission in their modified street or strip vehicle. The 258mm (10 1/4-inch) diameter offers a perfect middle ground—its lightweight design significantly reduces rotational mass for rapid throttle response and quick acceleration, while maintaining enough surface area for excellent streetability and efficient torque transfer.

Engineered to handle serious power and heavy track abuse, this Pro Series converter features a rigid billet steel front cover and billet piston to completely eliminate flexing and ballooning under load. It boasts a massive 100 square inches of clutch lining, providing unmatched holding capacity for wide-open throttle (WOT) lock-up. Internally, it utilizes a flanged style impeller hub for superior anti-flex durability, and the assemblies are fully furnace brazed with hand TIG welding. Hand-assembled to exacting tolerances, this converter delivers dominant track performance while remaining incredibly strong and reliable.

Key Features

• Designed specifically for Ford 4R100 and E4OD transmissions
• 258mm (10 1/4") diameter delivers a superior balance of rapid engine response and streetable torque holding
• 100 Square inches of Clutch Lining for extreme WOT Lock-Up holding capacity
• Rigid one-piece billet front cover and billet piston prevent flexing and ballooning
• Flanged style impeller hub engineered for superior anti-flex durability
• Fully furnace brazed internals with hand TIG welded construction
• Lightweight design that remains incredibly strong under massive torque loads
• Hand-assembled to exacting tolerances for dominant track performance

Specifications

• Application: High-Performance Street/Strip Torque Converter
• Transmission Compatibility: Ford 4R100 / E4OD
• Converter Diameter: 258mm (10 1/4")
• Construction: Billet Front Cover, Furnace Brazed, Hand TIG Welded
• Bearings: Heavy-Duty Torrington Bearings
• Options: Multiple Stall Speeds (2800 up to 3700 RPM), Sprag Options, and Bolt Pattern Options

Notes

• Custom manufactured product built to your exact specifications.
• Estimated lead time: 3-4 weeks.