Boss Hog 47012 Night Stalker Torque Converter | GM TH350/TH400 | 2200–2800 RPM Stall

The Boss Hog 47012 Night Stalker Series Torque Converter is built for GM TH350 and TH400 automatic transmissions. It delivers a stall speed of 2200–2800 RPM and is ideal for mildly upgraded or near-stock street-driven vehicles. With a 12" factory core and 10.75" bolt circle, it provides dependable performance and smooth engagement.

Crafted in the USA with quality components, this converter features a CNC-machined 30 spline turbine hub, hardened chromoly impeller hub, Torrington-style bearings, and a heavy-duty stator. Every unit is digitally balanced, leak-tested, and ready to handle real-world use.

Fitment Note: Will not interchange with TH350C. Compatible with TH400 when used with the correct flexplate.

Upgrade Tip: If you've upgraded the intake, headers, cam, or gears, consider moving up to the Street Bandit Series. For nitrous or forced induction builds, step up to the Outlaw Racing Series.

Key Features

• 2200–2800 RPM stall speed range

• Fits GM TH350 and TH400 (requires correct flexplate for TH400)

• Will not fit TH350C

• 12" factory-size core

• 10.75" bolt circle

• 30 spline turbine hub (CNC machined)

• 1.703" crank pilot

• Bolt size: 10mm x 1.5 pitch (Class 10 or stronger)

• Hardened chromoly impeller hub

• Torrington-style incased bearings

• Modified extreme-duty stator

• No anti-balloon plate

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

• Leak and pressure tested

• Digitally balanced

• Steel construction with black painted finish

• Made in the USA

• Sold individually

Vehicle Fitment

• GM vehicles with TH350 automatic transmission

• Also fits TH400 with proper flexplate

• Not compatible with TH350C

• Ideal for lightly modified or factory-spec street applications

What’s Included

• 1x Boss Hog 47012 Night Stalker Torque Converter

Installation Tips

• Use Type F transmission fluid

• Install an auxiliary transmission cooler

• Apply blue Loctite to all converter bolts