Boss Hog 48402 Night Stalker Torque Converter | GM 700R4/200R | 2200–2800 RPM Stall | Lock-Up | 27 Spline

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