4L80E 4L85E LS Night Stalker 200 RPM Over Stock Lock Up GM Towing Torque Converter Part Number 4948HD

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

Achieve maximum performance and reliability with our Night Stalker Series torque converter, engineered specifically for GM Chevy LS applications. This heavy-duty unit is designed to handle high loads while maintaining a precise stall range, making it the perfect match for your upgraded drivetrain. Built in-house and rigorously tested, this converter ensures seamless power transfer from engine to transmission.

Our commitment to quality is reflected in every component, from the hardened chrome impeller hub to the digitally balanced assembly. Don't settle for less—install a proven, high-performance torque converter built to withstand extreme conditions and deliver peak power delivery when you need it most.

Product Specifications

• Series: Night Stalker Series
• Application: GM Chevy LS Engines (For 2 step input shaft)
• Part Number: 4948HD (See images for visual confirmation)
• Stall Range: 200 - 300 RPM (Over stock)
• Impeller Hub: Hardened Chrome Molly, 2 inch Diameter (See pictures)
• Core Size: Factory 13 inches
• Bolt Circle Diameter: Factory 11.675 inches
• Input Shaft: 35 Spline Input Shaft for 2-step compatibility
• Stator: Modified Extreme Duty Stator
• Bearings: Torrington Style Incased Bearings
• Lockup Clutch: Oversized Extreme Duty Single Disk Lock Up
• Crank Pilot Diameter: 1.703 inch
• Bolt Size: 10mm X 1.5 Pitch (Class 10.9 or Stronger)
• Construction: Anti-Balloon Plates, Digitally Balanced, 4 Corner Tac Welded/Furnace Brazed Fins
• Testing: Leak & Pressure Tested, Extreme Temp Heavy Duty O-ring Seal

Installation and Performance Guidance

• Use Type F Transmission Fluid for optimal operational performance.
• Always utilize a transmission cooler to maintain fluid integrity under extreme use.
• Apply Blue Loctite during installation for maximum security.

Important Considerations

• Advertised stall ranges are based on a specific vehicle setup; actual performance will vary depending on your vehicle's configuration.
• Vehicles with taller tires or significant gear ratio changes may require additional gearing adjustment for ideal match.
• For maximum performance potential, consider upgrading to a "Street Bandit Series" if you have also upgraded your intake, headers, exhaust, or gearing.
• If utilizing power adders such as Nitrous Oxide (NOS), Turbocharger(s), or Supercharger, we recommend pairing this with an "Out Law Series" torque converter.

Our company has been building high-performance and racing converters since 1970. We are a veteran and family-owned operation dedicated to quality assurance at every stage.

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