FTI 9.5in NAG1/722.6 Multi-Plate Lock-Up Street Racer Series - 2800 Stall

Multi-Plate Billet Lock-Up Converter Built for High-Horsepower NAG1 and 722.6 Applications

The FTI FTISRT83380 is a 9.5-inch multi-plate billet lock-up street racer series torque converter engineered for NAG1 and 722.6 transmissions found in Dodge Challenger, Charger, Magnum, and Chrysler 300 platforms. Running a 2800 RPM stall speed, the FTISRT83380 balances strong street driveability with the converter flash and transmission response demanded on the strip. FTI builds each unit using a forged billet lock-up cover, furnace brazing, hand TIG-welded internal fins, and triple Torrington bearings for a converter rated to 1,000 HP. The result is a drop-in unit that delivers repeatable, consistent performance run after run with a full 3-year warranty from FTI Performance.

Key Features

• FTISRT83380 SRT series 9.5-inch multi-plate billet lock-up converter for NAG1 and 722.6 transmissions
• 2800 RPM stall speed tuned for street and strip driving with a broad powerband
• 1,000 HP rated for high-output naturally aspirated and boosted applications
• Forged billet lock-up cover with triple-clutch design for maximum reliability under hard launches
• Furnace brazed internals for increased structural integrity and reduced heat soak
• Hand TIG-welded stator fins for improved flow and durability
• Triple Torrington premium name-brand bearings for long converter service life
• Anti-ballooning flanged hub prevents converter expansion under sustained high-RPM operation
• Bolt circle: 10.200 inches
• 22 input splines
• Backed by a 3-year FTI Performance warranty

Fitment

Specifications

What's Included

• FTISRT83380 9.5-inch multi-plate billet lock-up torque converter (1 unit)
• FTI Performance documentation
• Note: Mounting hardware is not included

About FTI Performance

FTI Performance has been engineering high-performance torque converters and transmission components since 1981. Based in the United States, FTI produces each converter to order using billet components, precision balancing, and race-proven internal construction methods. The SRT series converters are specifically designed for NAG1 and 722.6 platform vehicles and are a preferred choice for Mopar performance builds ranging from street-driven muscle cars to dedicated track vehicles.

Related Parts on Our Site

• Transmission and Drivetrain Components

Frequently Asked Questions

The FTISRT83380 is a 9.5-inch multi-plate billet lock-up street racer series torque converter from FTI Performance, built for NAG1 and 722.6 transmissions. It features a 2800 RPM stall speed and is rated to 1,000 HP for Mopar applications including the Dodge Challenger, Charger, Magnum, and Chrysler 300.

The FTISRT83380 is designed for the NAG1 and Mercedes-Benz 722.6 automatic transmission family used in Chrysler and Dodge vehicles equipped with 5.7L and 6.1L HEMI engines. Confirm your specific transmission code before ordering to ensure compatibility.

Stall speed is the RPM at which the torque converter reaches peak fluid coupling efficiency and begins multiplying torque. A 2800 RPM stall on the FTISRT83380 means the engine will rev to approximately 2800 RPM before the transmission begins to pull the vehicle forward during a launch, placing the engine closer to its peak torque range for improved 60-foot times and overall acceleration.

Higher stall converters can generate more heat during low-speed cruising compared to factory units. FTI recommends adding an auxiliary transmission cooler when using the FTISRT83380 for any sustained driving or track use. This is standard practice for any performance converter upgrade on NAG1-equipped vehicles.

Installing a performance torque converter on a NAG1-equipped vehicle often benefits from a corresponding transmission tune to adjust shift firmness, lock-up scheduling, and torque reduction tables. Consult a tuner experienced with NAG1 platforms before or after installation to maximize the converter's performance potential.

Yes. The FTISRT83380 is designed to be a direct replacement using the factory NAG1 or 722.6 bell housing and flexplate mounting points. No modifications to the transmission or flexplate are required. Confirm the 10.200-inch bolt circle and 22-spline count match your specific application before installation.

FTI Performance backs the FTISRT83380 with a 3-year warranty covering defects in materials and workmanship. The warranty applies to street-driven applications and requires proper installation per FTI guidelines. Racing or sustained competition use may affect warranty coverage.

The multi-plate lock-up design on the FTISRT83380 uses additional clutch friction surfaces compared to a single-disc converter. This results in a stronger, more progressive lock-up engagement that better handles the torque spikes produced by high-output HEMI engines, reducing slip and heat generation during hard acceleration.

Installation Instructions

1. Drain the transmission fluid and remove the transmission oil pan if access is required.
2. Remove the factory torque converter by unbolting it from the flexplate using the access port in the bell housing.
3. Inspect the flexplate for any cracks or damage and replace if necessary before installing the new converter.
4. Pre-fill the FTISRT83380 with the appropriate quantity of ATF fluid per FTI's specifications before installation to prevent dry starts.
5. Carefully seat the FTISRT83380 onto the transmission input shaft, ensuring all splines and the pilot are fully engaged before bolting to the flexplate.
6. Torque the flexplate-to-converter bolts to factory specification in a cross pattern.
7. Reinstall the transmission, refill with fresh ATF fluid, and check for leaks before operation.
8. Allow the transmission to reach operating temperature on the first drive and recheck fluid level.

WARNING: This product can expose you to chemicals including nickel compounds, which are known to the State of California to cause cancer, and carbon monoxide, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.