The Boss Hog 49452 Night Stalker Series Torque Converter is designed for GM LS applications using the 4L60E, 4L65E, or 4L70E automatic transmissions (1998 and newer with 300mm input shaft). With a stall range of 2200–2800 RPM, it delivers enhanced street performance with excellent drivability for daily use and mild performance setups.

Built from a factory-style 12-inch core and engineered with precision components including Torrington-style bearings and a hardened chromoly impeller hub, this lock-up converter balances reliability and lightweight efficiency. Every unit is leak-tested, digitally balanced, and made in the USA.

Upgrade Suggestions:
Use the Street Bandit Series if your vehicle has upgraded intake, cam, or exhaust. For nitrous, forced induction, or trans brake applications, step up to the Outlaw Series.

Key Features:

• Stall Speed Range: 2200–2800 RPM

• Transmission Compatibility: GM 4L60E / 4L65E / 4L70E (1998+ with 300mm LS input shaft)

• Lock-Up Compatible: Yes

• Core Diameter: 12 inches (factory size)

• Input Splines: 30

• Crank Pilot Diameter: 1.703 inches

• Bolt Circle: 11.125 inches

• Bolt Size: 10mm x 1.5 pitch (Class 10)

• Anti-Balloon Plate: Not included

• Construction Highlights:

  • Hardened chromoly impeller hub

  • Encased Torrington-style bearings

  • Modified heavy-duty stator

  • Extreme-duty lock-up liner

  • 4-corner tack welded or furnace brazed fins

• Testing: Leak and pressure tested, digitally balanced

• Material: Steel

• Finish: Black painted

• Made in the USA

• Quantity: Sold individually

Vehicle Fitment:

• GM LS-based vehicles with 4L60E, 4L65E, or 4L70E transmissions

• Fits 1998 and newer with 300mm 2-step input shaft

• Designed for stock to mildly modified street builds

What's Included:

• (1) ACC Performance 49452 Night Stalker Lock-Up Torque Converter

Installation Tips:

• Use Type F transmission fluid

• Always install an auxiliary transmission cooler

• Apply blue Loctite to all bolts during installation