4L80E 4L85E LS Night Stalker Series 200 RPM Over Stock Lock Up GM Towing Torque Converter Part Number 4949HD

Night Stalker Series Torque Converter for GM Chevy LS Engines

Upgrade your drivetrain with our premium Night Stalker Series Torque Converter, specifically engineered for the GM Chevy LS platforms. This unit offers exceptional durability and performance, matched with a 200-300 RPM stall range (depending on vehicle setup), ensuring reliable power transfer whether you're running street drives or performance builds. Constructed with extreme duty components, this converter is built to handle the rigorous demands of high-performance modern engines.

Product Specifications

• Application: Fits GM Chevy LS Engines (Factory 13-inch Core Size)
• Series: Night Stalker Series (High Performance/Extreme Duty)
• Part Number: 4949HD (LS 4L80E / 4L85E Conversion)
• Stall Range: 200 - 300 RPM (Dependent on vehicle configuration)
• Impeller Hub: Hardened Chrome Molly, 2.5 inch Impeller Hub
• Input Shaft: 35 Spline, optimized for the 2-step input shaft
• Bolt Circle: Factory 11.675 inch (Supports 10mm X 1.5 Pitch bolts, Class 10.9 or stronger)
• Bearings: Torrington Style Incased Bearings
• Key Features: Modified Extreme Duty Stator, Oversized Extreme Duty Single Disk Lock Up, Anti-Balloon Plates, No-Leak/Pressure Tested
• Pilot Diameter: 1.703 inch Crank Pilot

Commitment to Quality

Every torque converter undergoes rigorous quality inspections, including Leak & Pressure Testing and Digital Balancing. The construction features 4-Corner tac Welded Fins or Furnace Brazed connections, ensuring maximum strength and longevity.

Application Notes

• All advertised stall ranges are based on a specific vehicle's setup and may vary depending on your particular application. Contact us for personalized recommendations regarding optimal stall speeds.
• For best operational results, use Type F Transmission Fluid.
• Always install an additional transmission cooler to maintain optimal operating temperatures and protect your components.
• Apply Blue Loctite during assembly for maximum security of hardware.

Performance Recommendations

• If you have upgraded intake, headers, exhaust, or cam profiles, we recommend upgrading to our "Street Bandit Series" torque converter for a balanced fit.
• If your application includes power adders (Nitrous, Turbocharger, Supercharger, or Trans Brake), consult our "Out Law Series" converters for maximum performance capacity.

Built Since 1970: Our company has been building high-performance and racing converters for generations. We are a Veteran & Family Owned business dedicated to quality manufacturing in the USA.

Important Safety Notice: Please be aware that certain vehicles may require additional gearing, especially when running taller tires. Also note the warning regarding P65 exposure (Cancer and Reproductive Harm).