Chevy / GM Transmissions

Chevy / GM Transmissions
Choose Transmission
Allison 1000 2004.5-2006 6L80 2014-2021

HORSEPOWER RANGE

350-500

Daily Driving

Superior cooling and
factory-plus reliability.

CORE UPGRADES

Valve Body:
BD Recalibrated for Crisp, Predictable Shifts

Clutch Strategy:
High-Energy Friction Materials

Internal Hardware:
HD Solenoids & Upgraded Pressure Regulation

WARRANTY

Parts | 24 Months, 100k
Labor | 12 Months, 24k
Choose Transmission
Allison 1000 2001-2016

HORSEPOWER RANGE

500-600

Heavy-Duty Use

Handles consistent high torque
and heavy haul loads.

CORE UPGRADES

Valve Body:
High-Flow for Reduced Heat and Thermal Loading

Clutch Strategy:
Increased Count for Heavy-Haul Loads

Internal Hardware:
Enhanced Sealing & Billet Accumulators

WARRANTY

Parts | 36 Months, 150k
Labor | 12 Months, 24k
Choose Transmission
Allison 1000 2001-2016

HORSEPOWER RANGE

600-700+

High-Performance Street

Built for rapid acceleration
and massive Duramax torque.

CORE UPGRADES

Valve Body:
Performance-Spec High Line Pressure Strategy

Clutch Strategy:
Maximum Surface Area "Big Stack" Friction Packs

Internal Hardware:
Billet Input Shaft Included

WARRANTY

Parts | 36 Months, 150k
Labor | 12 Months, 24k

The BD Diesel
Engineering Advantage

Advanced Hydraulic Management

To eliminate clutch slippage and the dreaded "limp mode," we've completely redesigned the hydraulic circuits. Our valve bodies are recalibrated to deliver the consistent, high line pressure required to clamp heavy-duty clutch packs firmly, even under the extreme torque of a modified Duramax engine.

Thermal Protection & Cooling Efficiency

Heat is the #1 killer of the Allison 1000. We address factory cooling bottlenecks by increasing fluid flow and capacity. By pairing our builds with deep-sump aluminum pans and high-flow filters, we lower operating temperatures during sustained heavy hauling.

Premium Mechanical Hard Parts

From billet input shafts to reinforced hub assemblies, we replace high-failure "soft" parts found in OEM units. Our TowMaster and TorqueMaster builds utilize high-strength alloys and increased clutch surface areas to handle the violent shifts and massive torque loads of high-horsepower applications.

Transmission Selection Guide

  1. Confirm Your Platform & Year Range

    Ensure fitment for the Allison 1000 5-speed (2001-2005), 6-speed (2006-2016). Selecting the correct year is critical for electronic solenoid compatibility, adaptive shift strategies, and input shaft spline counts.

  2. Match the Build Tier to Your Horsepower & Use

    Don't over-build or under-spec. A RoadMaster is optimized for daily reliability and stock power, while our TorqueMaster is engineered with a billet input shaft and high-pressure valve body for 600+ HP tuned street applications.

  3. Factor in Towing & GCWR Requirements

    Heat is the primary cause of Allison transmission failure. If you are frequently at max towing capacity, prioritize a tier with increased clutch surface area-like our "Big Stack" OD-and a heavy-duty deep sump oil pan for improved fluid cooling and filtration.

  4. Coordinate with Your Tuning Strategy

    High-performance diesel tuning requires a hardware-to-software match. Ensure your tuner's shift and line pressure strategy aligns with the valve body specifications and upgraded friction materials of your chosen BD build.

  5. Protect Your Investment: The Cooling System

    Never install a performance transmission behind a contaminated cooler. We recommend a professional hot flush or cooler replacement to ensure zero debris enters your new unit during the initial break-in period.

Transmission Lookup Table

Use your truck's model year and engine as a quick guide to identify your transmission family. For Heavy-Duty (HD) or Chassis-Cab models, always verify by the door sticker codes, build sheet, or the identification tag on the transmission case.

Transmission Engine Model Years Notes
Allison 1000 (5-Speed) 6.6L Duramax (LB7 / LLY) 2001-2005 Found in Early 2500DH/3500HD Silverado & Sierra.
6L80 5.3L / 6.0L / 6.2L Gas 2003-2010 Common in light-duty Silverado/Sierra 1500 models.
Allison 1000 (6-Speed) 6.6L Duramax (LBZ / LMM / LML) 2006-2016 Standard heavy-duty 6-speed for Duramax pickups.

How Do I Choose the Right BD Transmission for My Chevy/GM Truck?

Click your application (Allison 1000 or 6L80 + your year range) Pick a tier based on how you use the truck + your horsepower goal (daily/light performance, towing/heavy-duty, or higher-power).

What Chevy/GM Transmissions does BD Offer?

The current line up incudes applications for Allison 1000 (2001–2016), Allison 1000 (2004.5–2006), and 6L80 (2014–2021).

What’s the difference between each build tier?

BD offers 3 build levels based on use + power goals: - RoadMaster (350–450hp): daily driving + light performance - TowMaster (500–600hp): towing/heavy-duty use - TorqueMaster (600–700+hp): higher power / high torque demands

What Should I Choose if I Tow Heavy?

The TowMaster is designed specifically for extra weight and heavy towing requirments. Depending on other upgrades made to the vehicle it never hurts to upgrade to the TorqueMaster for that peace of mind.

What Should I Choose if I’m Tuned or Building for Higher Power?

Use the high-performance section targeting 600–700+hp, and look for packages that include the hard-part upgrades your build needs (ex: billet input options on certain TorqueMaster packages).

I’m Not Sure Which GM Transmission I Have; What Should I Do?

Use your model year, then confirm whether you have an Allison 1000 or 6L80, and match that to the application buttons on the page.

Can I Talk to a Real Person at BD before I Buy to Confirm I’m Choosing Correctly?

Yes! Our sales team is ready to help give us a call at 800-887-5030.