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