GMC Sierra Transmission & Converter Package - BD Diesel TowMaster (2017–2019). A purpose-built upgrade for Sierra 6.6L Duramax (L5P) with the Allison 1000, combining BD’s TowMaster transmission and a ProForce torque converter for dependable towing and daily use.

Built for stock or mildly modified trucks, TowMaster enhances durability with a revised valve body, increased line pressure, pump modifications, and added clutch capacity—raising torque-holding capability by over 80% per BD. The BD deep cast-aluminum pan adds an extra 3.5 quarts for improved cooling and service intervals, while the matched converter delivers efficient coupling under load to curb slip and heat when pulling.

Features

• Modified valve body and pump for crisp, controlled shifts
• Increased clutch counts and line pressure for higher torque capacity
• BD deep aluminum pan (+3.5 qt) for cooler temps while towing
• Includes BD ProForce torque converter
• Fits 2017–2019 GMC Sierra 6.6L Duramax (L5P) with Allison 1000

Have questions about fitment or supporting upgrades? Call us at 512-982-9393 (TX) or 562-981-6800 (CA). We have locations in Austin, Texas and the Los Angeles, California area offering professional installation and customization services.

Purchasing multiple items? Contact us for potential shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov