TC Remanufacturing B81NS Automatic Transmission Torque Converter

Automatic Transmission Torque Converter for GM HD Applications

TC Remanufacturing B81NS is an automatic transmission torque converter built for a wide range of Chevrolet, GMC, Hummer, and select Rolls-Royce applications. It features a 13.750-inch converter diameter, low-stall operation, and lock-up design for direct-fit service in compatible GM truck and van platforms.

Key Features

• Part number: B81NS
• Automatic transmission torque converter
• Lock-up converter type
• 13.750-inch converter diameter
• Low-stall calibration
• 11.500-inch bolt circle
• 6-pad mounting type
• 1.703-inch pilot diameter
• 30-spline count
• Milled flats hub with 2.050-inch hub height
• No ring gear
• Fits applications using converter codes 24202989, 24210827, 24210828, 24210829, 24210862, 24211407, 24217236, 24217328, 24217609, 2419327, 24219329, 24228538, and 24240863

Fitment Overview

Compatible With 1992-2009 GM truck, van, and SUV platforms, including Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 2500, GMC Savana 3500, Chevrolet Silverado 1500 HD, Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500, GMC Sierra 1500 HD, GMC Sierra 2500, GMC Sierra 2500 HD, GMC Sierra 3500, GMC Yukon XL 2500, Chevrolet Suburban 2500, Hummer H1, and select Rolls-Royce Corniche and Park Ward applications. This part number, B81NS, is also listed for Chevrolet Silverado 2500 HD Classic and GMC Sierra 2500 HD Classic 2007 models.

What This Torque Converter Helps Address

• Transmission shudder during lock-up operation
• Delayed or inconsistent engagement from a worn converter
• Excessive slip under load in GM HD truck and van applications
• Vibration or drivability issues tied to converter wear
• Restoration of proper torque transfer in automatic transmissions

Installation Notes and Tips

Verify the converter code, spline count, bolt circle, pilot diameter, and hub style before installation. B81NS is a lock-up torque converter with a 30-spline configuration, so matching the transmission and application details is essential for correct fitment. For best results, inspect the transmission cooler and flush the system before installing the replacement converter.

Quality Assurance

TC Remanufacturing supplies remanufactured drivetrain components for service replacement use. This part cross-references ACDelco and GM OE applications for the same vehicle coverage, making it a practical replacement choice for GM truck, van, and SUV service work.