FTI 9.5in 4L80E/4L85E Billet Lock-Up Street Racer Series - LS - 4000 Hard Hit Stall

FTI Performance 9.5" 4L80E/4L85E Billet Lock-Up Street Racer Series Torque Converter – LS Engines, 4000 Stall

The FTI Performance 9.5" Billet Lock-Up Street Racer Series Torque Converter is a high-performance upgrade for GM 4L80E and 4L85E transmissions paired with LS engines. This converter features a computer-designed, CNC-machined billet front cover and a billet lock-up piston that virtually eliminates premature clutch wear. With a custom stator design and optimized blade angles, it delivers a 4000 RPM hard-hit stall tailored for street and strip performance. The unit is furnace-brazed and heli-welded for maximum strength, includes a severe-duty sprague, and an anti-ballooning flanged impeller hub, making it extremely durable even under high horsepower and aggressive driving. Built to your exact needs and driving style, this Street Racer Series converter provides improved launch, better power transfer, and reliable lock-up operation.

Key Features

• Billet Front Cover & Lock-Up Piston – CNC-machined for durability and to prevent premature clutch wear
• 4000 RPM Hard-Hit Stall – Optimized for strong launches and street/strip performance with LS engines
• Furnace-Brazed & Heli-Welded Fins – Superior strength and heat resistance
• Severe-Duty Sprague & Anti-Ballooning Hub – Ensures reliability under high power and RPM
• Custom-Built Design – Tailored to your specific engine, transmission, and driving style

Whats Included

• FTI SRL Series Billet Lock-Up Torque Converter (9.5", 4000 stall)

Product Notes

• Specifically built for 4L80E/4L85E transmissions behind LS engines
• Billet construction and custom tuning provide excellent street manners with strong track performance
• Professional installation and transmission tuning are highly recommended

Installation Notes

• Requires transmission removal for installation
• Estimated time: 4–8 hours (professional installation strongly recommended)
• Proper stall speed matching and transmission programming are critical

Why Choose FTI Performance Torque Converters?

• Precision CNC-machined billet components for unmatched strength and reliability
• Custom-built to your exact specifications and driving style
• Proven performance in high-horsepower street and racing applications

Frequently Asked Questions

• Q: Is this converter suitable for my LS-powered 4L80E build?
  A: Yes, it is designed for GM 4L80E and 4L85E transmissions paired with LS engines.
• Q: What stall speed does this converter have?
  A: This model features a 4000 RPM hard-hit stall, optimized for strong launches.
• Q: Is professional installation required?
  A: Yes, torque converter installation involves transmission removal and precise setup. Professional installation is highly recommended.

Shipping & Handling

• Method: Ground UPS or FedEx
• Availability: In stock – ships same or next business day
• Packaging: Secure FTI Performance retail packaging