FTI 9.5in 4L60E/4L65E/4L70E Billet Triple Disc Lock-Up Street Racer Series - LS - Custom Stall

Billet Triple Disc Torque Converter Built for GM LS-Powered 4L60E, 4L65E, and 4L70E Street Strip Applications

The FTI FTISRLS0086-3 is a 9.5-inch billet triple disc lock-up torque converter engineered for GM vehicles running the 4L60E, 4L65E, or 4L70E automatic transmission with an LS engine. Rated at 3,600 RPM stall and built to handle up to 1,000 horsepower, the FTISRLS0086-3 delivers faster, sharper launch response than a stock converter while retaining full lockup capability for efficient highway cruising. FTI hand-builds every FTISRLS0086-3 with a forged billet lock-up cover, furnace-brazed internal fins, and triple Torrington bearings for exceptional durability in demanding street and strip use.

Key Features

• 9.5-inch diameter billet triple disc lock-up torque converter for 4L60E/4L65E/4L70E
• 3,600 RPM stall speed rated for street/strip LS applications
• 1,000 HP rated for high-output engine builds
• Forged billet lock-up cover for maximum durability
• Furnace-brazed internal fins for added rigidity
• TIG-welded construction for increased structural integrity
• Triple Torrington bearing assembly for extended service life
• Anti-ballooning flanged hub eliminates high-RPM converter swell
• 30-spline input shaft, 1.703-inch crank pilot diameter
• Bolt circle compatible with 10.75-inch, 11.5-inch, and 11.062-inch LS patterns
• Fully balanced and lockup compatible
• Mounting hardware included
• 3-year warranty from FTI Performance

Fitment

Specifications

What's Included

• 1x FTI FTISRLS0086-3 billet triple disc torque converter
• Mounting hardware

About FTI Performance

FTI Performance has been manufacturing high-performance torque converters and transmission components in the United States for decades. Their Street Racer Lock-Up series is engineered for enthusiasts who demand race-derived performance without sacrificing street drivability. Every FTI converter is hand-assembled, individually balanced, and backed by a 3-year warranty.

Frequently Asked Questions

The FTISRLS0086-3 fits any GM vehicle equipped with the 4L60E, 4L65E, or 4L70E automatic transmission paired with an LS-series engine. Common applications include Chevrolet Camaro, Corvette C5, Silverado, Colorado, and GMC Sierra/Yukon platforms from the early 1990s through the early 2010s.

The FTISRLS0086-3 is rated at 3,600 RPM stall speed. Actual stall speed can vary slightly based on your engine combination, gear selection, and vehicle weight. This stall range is ideal for street/strip builds with LS engines making 400-1,000 horsepower.

A triple disc torque converter uses three clutch discs in the lock-up assembly instead of one. This distributes clamping load across more surface area, resulting in stronger, more consistent lock-up engagement, better heat management, and greater durability under repeated hard launches and high-power applications.

Yes. The FTISRLS0086-3 is fully lockup compatible and works with factory 4L60E/4L65E/4L70E lockup wiring and TCC solenoid systems. No modifications are required for the lockup circuit in a stock wiring harness.

The FTISRLS0086-3 is rated at 1,000 HP, making it suitable for both naturally aspirated and forced induction LS builds including supercharged, turbocharged, and nitrous-equipped combinations.

Yes. Every FTI torque converter including the FTISRLS0086-3 is individually balanced at the factory before shipping. The unit is also equipped with an anti-ballooning flanged hub to prevent converter swell at high RPM.

FTI recommends performing several moderate-effort launches before making full-power runs. This allows the triple disc lock-up assembly to seat properly and ensures consistent engagement behavior from the first full-throttle application.

Use Dexron VI or an equivalent GM-spec automatic transmission fluid. Do not use fluids containing friction modifiers that may affect lock-up clutch engagement. Change the fluid after the first 500 miles of spirited driving to flush any manufacturing residue.

Installation Overview

1. Drain transmission fluid and remove the driveshaft, crossmember if needed, and transmission crossmember
2. Support the transmission with a jack and remove the transmission from the vehicle
3. Remove the flexplate bolts and slide the stock torque converter off the transmission input shaft
4. Install the FTISRLS0086-3 onto the transmission input shaft, rotating until it fully seats (you should feel two distinct clicks as the converter engages the pump and stator)
5. Reinstall the transmission, verifying converter-to-flexplate clearance before torquing flexplate bolts
6. Torque flexplate-to-converter bolts to factory specification (typically 44 ft-lbs for GM LS applications)
7. Reinstall driveshaft, refill with fresh Dexron VI transmission fluid, and check for leaks
8. Perform several light-duty launches before full-power use

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.