Product Overview

The introduction of the Allison 1000 transmission to the diesel truck market restored confidence in consumers that an automatic transmission can indeed handle the demands of exhaust braking without any electronic addition. But while the Allison is suitable for stock applications, we’ve found that it does have its limitations— particularly when flywheel horsepower exceeds 370 horsepower. That’s when the stock clutch packs can begin to slip, putting the computer in the dreaded “limp home” mode and once a clutch has slipped, the next time it will slip easier and easier. At BD, we make several modifications to the Allison to meet the demands of high-performance and heavy-duty usage. A new convertor lock up valve, updated lube & regulator and pressure release spring has been installed. With either the C1 or C2 clutches being engaged in all gears, this creates a weak link in the transmission. We designed 20% more friction surface and use high energy clutch material. We have also added extra frictions in the remaining clutches to improve holding capacity. We have modified power pistons hydraulics and return springs are changed while main line oil pressure is raised to increase clamping force on the clutch packs. If you’ve modified, or plan to modify your Duramax, the first step should be a BD Allison transmission. Call us today! We also offer Build-it transmission rebuild kits with our modified parts for those that want to build their own performance transmissions. New for 2010 we now have available exchange units for behind the Duramax LMM engine. WARRANTY : 36-month / 150,000 mile limited warranty on non competitive, racing or sled-pulling applications. See warranty statement for further details.

Features and Benefits

• Increase The Durability Of Your Drivetrain
• TRANSMISSION:
• Aluminum HD Deep Transmission Pan
• Upgraded Sump Filter
• Reworked Front Pump
• Torque Convertor Enhanced Stall
• Stamped Forged 1 Piece Cover
• More Efficient Operation
• Furnace Brazed Fins
• No Race Abuse Covered
• Clutch Count: LOW REVERSE 6
• Clutch Count: INTERMEDIATE 5 (67% increase over stock)
• Clutch Count: DIRECT 6 (20% increase over stock)
• Clutch Count: OVERDRIVE 5 (67% increase over stock)
• Each transmission is dyno tested
• TORQUE CONVERTOR:
• Enhanced Stall - Street/Towing applications
• Modified stator enhances torque multiplying effect
• Lower rpm response than the stock converter
• Three high performance clutch surfaces
• Less heat and better fuel economy
• Stamp-forged steel front cover
• Furnace-brazed pump and turbine fins
• Improvements made to increase cooling and lubrication of the clutch plates
• High Yield Strength forged machined piston
• HD Damper assembly absorbs close to twice the stock capacity shock load
• BD aluminum HD deep pan, increases oil capacity by 6qt
• Replace plastic pressure plugs in valve body with aluminum
• Heavy duty snap ring and blow-off valve to prevent runaway pressure damaging case
• Clutch Count: COAST CLUTCH 3
• Clutch Count: FORWARD 4

Product Details