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Thumbnail Filmstrip of 2004.5-2005 6.6L LLY Duramax TowMaster Allison 1000 Transmission 4WD BD 1064724 Images
The BD Diesel 1064724 TowMaster is a rebuilt Allison 1000 5-speed automatic for 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500 4WD trucks with the 6.6L LLY Duramax. The factory Allison is built for stock power, so added fuel and heavy trailers lead to slipping, heat and burned clutches. This transmission adds clutch capacity and line pressure so it holds that load day after day.
BD adds clutch plates to every pack, installs high energy frictions, revises the oil circuits and fits new A and B trim valves so the clutches see full line pressure. A new converter lockup valve raises lockup pressure, and each unit is dyno tested before it ships with BD's deep aluminum pan. This is the transmission only; a BD torque converter must be installed with it to keep the warranty. Core required, refundable deposit at checkout.
Key Features & Benefits
- Increased Clutch Count: C1 8 clutches (+14%), C2 7 (+17%), C3 7 (+50%), C4 7 (+17%), C5 7 (+17%) over stock.
- Revised Hydraulics: New A and B trim valves and revised oil circuits deliver full line pressure for firm, consistent shifts.
- Lockup Valve: New converter lockup valve boosts lockup pressure to reduce converter slip.
- Drain Back and Pump Prime Kit: Maintains pump pressure at start-up.
- Deep Aluminum Pan: BD HD pan adds 3.5 quarts of fluid capacity to help control temperature.
- Dyno Tested: Every transmission is tested on BD's dyno before it ships.
Technical Specifications
- Manufacturer: BD Diesel Performance
- Part Number / SKU: 1064724
- Product Type: Performance automatic transmission (transmission only, no converter)
- Transmission: Allison 1000 5-speed, 4WD
- Truck Compatibility: 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500
- Engine Platform: 6.6L LLY Duramax
- Install Time: About 9 hours
- Core Requirement: Core required, refundable deposit at checkout
- Warranty: 36 months or 150,000 miles on parts, 12 months or 24,000 miles on labor; requires a BD torque converter; race use not covered
Vehicle Fitment & Technical Installation Notes
Fits 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500 4WD trucks with the 6.6L LLY Duramax and Allison 1000 automatic.
Installation Tip: Flush the transmission cooler and lines with a back-flow machine and oil-based cleaner before installing, never a water-based flush, and preload the torque converter with 2 quarts of fluid. Relearn the transmission adaptives after installation.
The BD Diesel 1064724 TowMaster is a rebuilt Allison 1000 5-speed automatic for 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500 4WD trucks with the 6.6L LLY Duramax. The factory Allison is built for stock power, so added fuel and heavy trailers lead to slipping, heat and burned clutches. This transmission adds clutch capacity and line pressure so it holds that load day after day.
BD adds clutch plates to every pack, installs high energy frictions, revises the oil circuits and fits new A and B trim valves so the clutches see full line pressure. A new converter lockup valve raises lockup pressure, and each unit is dyno tested before it ships with BD's deep aluminum pan. This is the transmission only; a BD torque converter must be installed with it to keep the warranty. Core required, refundable deposit at checkout.
Key Features & Benefits
Increased Clutch Count: C1 8 clutches (+14%), C2 7 (+17%), C3 7 (+50%), C4 7 (+17%), C5 7 (+17%) over stock.
Revised Hydraulics: New A and B trim valves and revised oil circuits deliver full line pressure for firm, consistent shifts.
Lockup Valve: New converter lockup valve boosts lockup pr[...]
The BD Diesel 1064724 TowMaster is a rebuilt Allison 1000 5-speed automatic for 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500 4WD trucks with the 6.6L LLY Duramax. The factory Allison is built for stock power, so added fuel and heavy trailers lead to slipping, heat and burned clutches. This transmission adds clutch capacity and line pressure so it holds that load day after day.
BD adds clutch plates to every pack, installs high energy frictions, revises the oil circuits and fits new A and B trim valves so the clutches see full line pressure. A new converter lockup valve raises lockup pressure, and each unit is dyno tested before it ships with BD's deep aluminum pan. This is the transmission only; a BD torque converter must be installed with it to keep the warranty. Core required, refundable deposit at checkout.
Key Features & Benefits
- Increased Clutch Count: C1 8 clutches (+14%), C2 7 (+17%), C3 7 (+50%), C4 7 (+17%), C5 7 (+17%) over stock.
- Revised Hydraulics: New A and B trim valves and revised oil circuits deliver full line pressure for firm, consistent shifts.
- Lockup Valve: New converter lockup valve boosts lockup pressure to reduce converter slip.
- Drain Back and Pump Prime Kit: Maintains pump pressure at start-up.
- Deep Aluminum Pan: BD HD pan adds 3.5 quarts of fluid capacity to help control temperature.
- Dyno Tested: Every transmission is tested on BD's dyno before it ships.
Technical Specifications
- Manufacturer: BD Diesel Performance
- Part Number / SKU: 1064724
- Product Type: Performance automatic transmission (transmission only, no converter)
- Transmission: Allison 1000 5-speed, 4WD
- Truck Compatibility: 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500
- Engine Platform: 6.6L LLY Duramax
- Install Time: About 9 hours
- Core Requirement: Core required, refundable deposit at checkout
- Warranty: 36 months or 150,000 miles on parts, 12 months or 24,000 miles on labor; requires a BD torque converter; race use not covered
Vehicle Fitment & Technical Installation Notes
Fits 2004.5-2005 Chevy Silverado and GMC Sierra 2500HD and 3500 4WD trucks with the 6.6L LLY Duramax and Allison 1000 automatic.
Installation Tip: Flush the transmission cooler and lines with a back-flow machine and oil-based cleaner before installing, never a water-based flush, and preload the torque converter with 2 quarts of fluid. Relearn the transmission adaptives after installation.
Fits: LLY Duramax 2004.5-2005 (Automatic Only, 4WD)