Boss Hog 46012 Night Stalker Torque Converter | GM TH400 | 2200–2800 RPM Stall

The Boss Hog 46012 Night Stalker Series Torque Converter is built for GM TH400 transmissions and is compatible with TH350 when used with the correct flexplate. Designed with a 12" factory-style core and a stall range of 2200–2800 RPM, this converter offers a solid balance between drivability and performance for street-driven applications.

Constructed with high-quality materials like a hardened chromoly impeller hub and Torrington-style bearings, it’s leak-tested, digitally balanced, and precision-built for consistent performance. Perfect for factory or mildly upgraded builds.

Upgrade Tip: Move up to the Street Bandit Series for builds with aftermarket intake, cam, or exhaust. Choose the Outlaw Series for power adder setups like nitrous, supercharger, or turbo.

Key Features

• 2200–2800 RPM stall speed range

• Fits GM TH400 (also fits TH350 with proper flexplate)

• 12" factory-style core

• 11.5" bolt circle

• 30 spline turbine hub (CNC machined)

• 1.703" crank pilot

• Bolt size: 3/8" x 16 TPI (Grade 8 only)

• Hardened chromoly impeller hub

• Torrington-style bearings

• Modified stator

• Fins are four-corner tack welded or furnace-brazed

• No anti-balloon plate

• Leak and pressure tested

• Digitally balanced

• Steel construction with black painted finish

• Made in the USA

• Sold individually

Vehicle Fitment

• GM vehicles equipped with TH400 transmission

• Also fits TH350 when used with compatible flexplate

• Ideal for factory or mildly upgraded street builds

What’s Included

• 1x Boss Hog 46012 Night Stalker Torque Converter

Installation Tips

• Use Type F transmission fluid

• Install an auxiliary transmission cooler

• Use blue Loctite on all mounting bolts