GM Service Manual Online
For 1990-2009 cars only

The mechanical components of the Aisin 55-51LE are as follows:

    • Torque converter assembly
    • Forward (C1) and direct (C2) clutch assembly
    • Rear sun gear assembly
    • Rear internal gear
    • Front sun gear
    • Front carrier assembly
    • Front internal gear and low clutch sprag (F2) assembly
    • Low and reverse clutch plates and disc assembly (B3)
    • Output gear assembly
    • Second coast clutch and second clutch hub and second clutch sprag (F1) assembly
    • Automatic transmission fluid pump, second coast clutch (B1) and second clutch (B2) assembly
    • 1-2 reverse clutch (B5) assembly
    • 1-2 reverse internal gear
    • 1-2 reverse carrier gear assembly
    • 3rd gear band assembly (B4)
    • 3rd gear band servo piston assembly
    • 4-5 clutch (C3) assembly
    • front differential transfer drive gear assembly
    • front differential assembly
    • Automatic transmission control valve body assembly

The electrical components of the Aisin 55-51LE are as follows:

    • Automatic transmission output speed sensor (OSS) assembly
    • Automatic transmission input speed sensor (ISS) assembly
    • Reverse, 1st shift solenoid valve assembly (S1) - black
    • 2-3, 3-4 shift solenoid valve assembly (S2) - black
    • 1-2, 2-3, reverse shift solenoid valve assembly (S3) - dark gray
    • 3-4, 4-5 shift solenoid valve assembly (S4) - blue
    • Reverse shift solenoid valve assembly (S5) - brown
    • Line pressure control solenoid valve assembly (SLT) - blue
    • Lock up pressure control solenoid valve assembly (SLU) - black
    • Shift pressure control solenoid valve assembly (SLS) - green
    • Automatic transmission fluid temperature (TFT) sensor
    • Park/neutral position switch assembly