The Boss Hog 48402 Night Stalker Series Torque Converter is designed for GM 700R4 and 200R transmissions using LT-type engines with a 3-step, 27-spline input shaft. Featuring a stall range of 2200–2800 RPM and a factory-size 12" core, this lock-up converter delivers reliable street performance with smooth engagement and efficient torque delivery.
Built with durable components such as Torrington-style bearings, a modified heavy-duty stator, and an extreme-duty lock-up clutch, this unit is leak-tested, digitally balanced, and made in the USA.
Upgrade Tip: Step up to the Street Bandit Series for builds with aftermarket cams, headers, or intake upgrades. For nitrous, turbo, or supercharger builds, choose the Outlaw Series.
Key Features
- 2200–2800 RPM stall speed range
- Lock-up compatible
- Fits GM 700R4 and 200R (LT-type engines with 3-step input shaft)
- 12" factory-style converter core
- 10.75" bolt circle
- 27 spline input shaft (count the smaller splines)
- 1.703" crank pilot
- Bolt size: 10mm x 1.5 pitch
- Torrington-style incased bearings
- Modified heavy-duty stator
- Extreme-duty lock-up clutch
- Extreme-temp heavy-duty O-ring
- No anti-balloon plate
- Fins are 4-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 equipped with 700R4 or 200R automatic transmissions
- For LT-type engines using a 3-step, 27-spline input shaft
- Ideal for street-driven builds with stock or mildly upgraded components
What’s Included
- 1x Boss Hog 48402 Night Stalker Lock-Up Torque Converter
Installation Tips
- Use Type F transmission fluid
- Install an auxiliary transmission cooler
- Use blue Loctite on all torque converter bolts