If your stock Allison is on its last legs or struggling to hold up to towing demands, the BD Diesel TowMaster 1064704 is the upgrade your 2001–2004 LB7 Duramax needs. This transmission-only package delivers enhanced clutch capacity, revised oiling, and a heavy-duty deep sump pan to keep temps under control. Whether you're stock or lightly modified, this transmission is engineered to give your drivetrain the longevity it deserves.

💰 $1,800 Refundable Core Deposit Required
⏱️ Estimated Install Time: 9 Hours

⚠️ Note: BD torque converter must be installed at time of installation. Using a third-party or OE converter will void the warranty.

✅ Key Features

TowMaster Transmission Highlights:

• BD Aluminum Deep Sump Pan (+3.5 quarts fluid capacity)

• High-energy frictions for improved torque handling

• Revised oil circuits for better lubrication and cooling

• Upgraded lock-up valve boosts converter clutch pressure

• A & B trim valves ensure full line pressure to clutch packs

• Increased clutch count over OEM for greater durability

  • C1: 8 clutches (+14%)

  • C2: 7 clutches (+17%)

  • C3: 7 clutches (+75%)

  • C4: 7 clutches (+17%)

  • C5: 7 clutches (+17%)

• Dyno-tested and validated for performance

• Converter sold separately (see Part: 1064704BM or 1064704SS for full package)

(BD Diesel Transmissions only have warranty when running a BD Trans & Converter)

🚙 Vehicle Compatibility

• 2001–2004 Chevrolet Silverado 2500HD/3500 6.6L LB7 Duramax (4WD)

• 2001–2004 GMC Sierra 2500HD/3500 6.6L LB7 Duramax (4WD)

Designed for use with the Allison 1000 5-speed automatic transmission.

📦 What’s Included

• BD TowMaster Allison 1000 Transmission Assembly (no converter)

• BD Deep Sump Transmission Pan (pre-installed)

• Internal upgrades: clutch packs, lock-up valve, trim valves

• Dyno-tested and validated unit

• Required warranty conditions documentation

🌎 Emissions Information

This product does not require an EO number for California. It is legal for sale and use in all 50 states. Replacement parts included. (EMS:4)