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

• Revised Oil Circuits/Extra Clutches
• Machined center support
• Has Stronger Internals
• No Race Abuse Covered
• Full shift kit with line mod valve to increase pressures
• Accumulator body enhanced oil flow
• Increased cooler pressure
• Increased pressure to converter
• Creates positive clutch application
• Created lube circuit for towing in overdrive
• 1990-2003 include auxiliary frame mounted full flow filter kit
• Clutch Count: COAST CLUTCH 2
• Clutch Count: FORWARD 5
• Clutch Count: DIRECT 5
• Machined intermediate piston
• Clutch Count: LOW REVERSE 7
• Clutch Count: INTERMEDIATE 4
• Clutch Count: OVERDRIVE 4
• Pan adds 6qt extra oil capacity
• Fully rollerized geartrain
• Tighter clutch packs that provide a quicker shift
• 30%-40% more clutch material with additional steels
• Improved internal lubrication by adding high power boost valves
• Reworked front pump
• Improved bearing designs
• Machined low/reverse pressure plate
• Upgrade supports
• Upgraded sprags
• Sure-loc snap rings
• Solenoids hard wiring providing high temperature resistance
• Increase the durability of your drivetrain
• Revised oil circuits
• Handles up to 300% more power and torque than the stock transmission
• Extra clutches and stronger internals
• BD rigid aluminum heavy duty transmission pan
• Pan reduces case flex
• Machined rear ring gear hub
• Pan reduces internal oil leakage
• Pan heat-dissipating fins keep temperature down
• Pan magnetic drain plug
• Not warranted for Race or Sled Pull use
• Each transmission is dyno tested
• Added lube circuits to OD planet
• Added lube and support to output and intermediate shafts
• Replaced all aluminum planetaries with steel
• Drilled and tapped direct and intermediate feeds to prevent leaks at case
• Re-programmed accumulator body

Product Details