Description
When the transmission of the motionless vehicle is placed in Drive, the transmission allows the vehicle to move off in first gear, then will change to second and then to third gear based on increase in road speed. The BW-35 will downshift from third to second and from second to first, also based on load. The transmission is equipped to produce kickdown and will upshift after kickdown if accelerator pressure is released following a kickdown.
As is common in automatic transmissions of its generation, power brought to the transmission via the torque converter drives hydraulic fluid. As the gears move faster or slower, pressure of the fluid increases or decreases in the case. Mechanical switching of gears is triggered by the increase or decrease of pressure. There are no electronic sensors or switches as found in modern transmissions. There is a Throttle Valve in the control valve body that is connected to the throttle linkage via a cable. This regulates internal pressure by throttle position. A secondary function of this cable is to down-shift ("kick down") to a lower gear when the Throttle Valve is in the full stop position (throttle pedal is fully depressed) and road speed is below a set point regulated by a mechanical governor on the output shaft.
The Borg Warner 35 automatic transmission comprises a torque converter and a fully automatic 3-speed hydraulically controlled epicyclic gear box. The automatic transmission provides three forward and one reverse gear ratio.
The hydraulic control system consists of a valve arrangement and an engine driven pump. The automatic transmission contains a planetary gear set consisting of two sun gears, two sets of three planet pinions contained within a planetary carrier and ring gear. Various speed ratios are obtained by holding or clutching various combinations of elements of the planetary train. This is performed by two bands, two multi-disc clutches and a one-way clutch.
The Borg Warner 35 was designed for use with Type F Automatic Transmission Fluid (ATF), which is far less common today than the Mercon/Dexron type.
Read more about this topic: Borg-Warner 35 Transmission
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