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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - Diagnosis - 4L80-E >> Component Description >> Solenoids >> Shift Solenoids "A" & "B"

Shift Solenoids "A" & "B"

Transmission is shifted up or down by 2 electric solenoids. Both solenoids are located on valve body. See Figure. Ignition power is supplied to each solenoid by the transmission fuse. Solenoid "A" controls hydraulic pressure to 1-2 and 3-4 shift valves. Solenoid "B" controls hydraulic pressure to 2-3 shift valve.

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