4L80E 4L85E LS Night Stalker Series 16-2,200 RPM Lock Up GM Torque Converter Part Number 49491

Night Stalker Series Torque Converter - Fits GM Chevy LS 4L80E/4L85E

Achieve peak performance and reliable shifting with our Night Stalker Series Torque Converter, specifically engineered for GM Chevy LS applications. This high-performance unit is designed to match factory specifications while offering extreme duty components necessary for modern muscle car builds. Restoring or upgrading your drivetrain with this digitally balanced, leak-and pressure tested unit ensures unmatched dependability and driveability.

Our commitment to quality is evident in every detail, from the furnace brazed fins to the high-quality components used throughout. Trust our veteran and family-owned company, building performance since 1970, to deliver a converter built for the road or the race track.

Product Specifications & Features

• Transmission Application: GM Chevy LS (4L80E/4L85E)
• Series: Night Stalker Series
• Part Number: 49491
• Stall Range: 1,600 – 2,200 RPM
• Impeller Hub: 2.5 inch Diameter (See accompanying diagram)
• Core Size: Factory 13 inch
• Bolt Circle Diameter: Factory 11.675 inch
• Input Shaft: 35 Spline
• Torque Converter Components: Modified Extreme Duty Stator, Hardened Chrome Molly Impeller Hub, Torrington Style Incased Bearings
• Construction: Oversized Extreme Duty Single Disk Lock Up, Tailored with Anti-Balloon Plates
• Pilot Diameter: 1.703 inch Crank Pilot
• Bolt Size Compatibility: 10mm X 1.5 Pitch (Requires Class 10.9 or stronger bolts)
• Quality Assurance: Digitally Balanced, Leak & Pressure Tested, Quality Inspections at Every Step

Installation and Performance Notes

• Stall ranges advertised are specific to a vehicle's unique setup; actual performance may vary. Please contact us for personalized installation advice regarding your specific vehicle configuration.
• This application may require additional gearing, especially when fitted with taller tires, to achieve optimal performance and durability.
• For best operational results and extended life of this unit, use Type F Transmission Fluid.
• We recommend pairing this torque converter with a transmission cooler to manage heat and maintain peak performance during aggressive driving.
• Ensure all fasteners are secured using Blue Loctite for maximum vibration resistance.

Upgrade Recommendations

While the Night Stalker is built to last, consider pairing it with our specialized series if you have upgraded components:

• Street Bandit Series: Recommended if you have upgraded intake, headers, exhaust, or gearing.
• Out Law Series: Recommended if your vehicle includes any power adders such as Nitrous Oxide (NOS), Turbocharger, Supercharger, or Trans Brake.

Building high-performance and racing torque converters since 1970. We are a family-owned business dedicated to your success.