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