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01-11 3680-01 1. OVERVIEW The six speed automatic (M78) transmission is available in two variants: four wheel drive and two wheel drive. The transmission has the following features: Six Forward Speeds One reverse gear A torque converter with an integral converter lock-up clutch Electronic shift and pressure controls A single planetary gear-set A double planetary gear-set Two hydraulically controlled brake bands Three multi-plate clutches All hydraulic functions are directed by electronic solenoids to control: - - - - - - - - - Engagement feel Shift feel Shift scheduling Modulated torque converter clutch applications · The transmission contains fully synthetic automatic transmission fluid (ATF) and is filled for life; therefore it does not require periodic servicing. Engine power reaches the transmission via a torque converter with integral converter lock-up clutch. The six forward gears and one reverse gear are obtained from a single planetary set, followed by a double planetary set. This type of gear-set arrangement is commonly known as Lepelletier type gear-set. The automatic transmission is electronically controlled. The control system is comprised of the following elements: External transmission control unit (TCU) Internal embedded memory module (EMM) Input and output speed sensors Valve body unit comprised of four on/off solenoid valves and six variable bleed solenoids Torque converter - - - - - |