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Duramax Allison Transmission 3 Disc Torque Converter

                   BD Diesel Duramax Allison Transmission Component and System Description 

Engine/Transmission Connection 
The converter housing of 1000 Series transmissions mates directly to the engine block. DB Diesel Flex plate drive is used for engine to transmission torque transfer.

 DB Diesel Duramax Torque Converter  
Several torque converter are available to match the transmissions to a wide variety of diesel and engines. The torque converter is a single-stage, poly phase, and 3-element unit, consisting of a pump, stator, and turbine. At lower output speeds, the torque converter multiplies torque and provides a fluid coupling to the engine. At higher speeds, the torque converter clutch. is automatically engaged to provide direct drive from the engine to the transmission. Hydraulic fluid for converter charging pressure comes from the sump and is supplied by the input pump. The TCC is applied or released by changing direction of fluid in the torque converter. An integral converter damper minimizes the need for additional engine vibration control.


BD Diesel Stage 5 Clutch Kit 
5 clutches, 2 rotating and 3 stationary, direct the flow of torque through the transmission. All range clutches are hydraulically actuated and spring-released, with automatic wear compensation. The transmission fluid cools the clutches. The transmission control module TCM signals solenoid valves to apply and release clutches based on speed and power combinations and the range selected by the operator.

Transmission Fluid Filtration 
Fluid filtration is provided by 2 filter systems. A suction filter, located in the sump, provides general protection to the entire hydraulic system by filtering large particulates. A spin-on filter provides full-time protection for the control solenoids and multiply pass protection for the entire system. The spin-on filter is externally located on the converter housing at the lower left front of the transmission.

  Control Valve Assembly 
The control valve assembly consists of 2 components. The main DB Diesel valve body contains the pressure control valves, the TCC valve, the exhaust back fill valve, and the control main relief valve. The shift valve bodie contains the shift valves, the control main pressure valve, and the manual selector valve. The control valve assembly attaches to the bottom of the main case module and is enclosed by the oil pan.

BD Diesel Remote Oil Cooler Provision 
Ports for remote-mount oil cooler lines are located on the right side of the converter housing near the converter housing/main housing spline. Remote oil-to-water coolers require plumbing for transmission fluid and engine-cooling water. Remote oil-to-air coolers may also be used and only transmission fluid lines need to be provided. Heat is transferred from the transmission fluid to either water or air depending upon the cooler type used..

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