GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Variable drive belt assembly (107)

Important: The variable drive pulley assembly (500), variable driven pulley assembly (106) and variable drive belt assembly (107) are usually replaced as a set if one or more of these components are damaged. Inspect each component as necessary.

Inspect for wear or scoring. Replace the variable drive belt assembly (107). Refer to Drive Belt Installation .

Forward clutch piston, Belleville, spring (502)

Inspect for damage or distortion. Replace the forward clutch piston, Belleville, spring (502). Refer to Forward Clutch Assembly Disassemble .

Input shaft assembly (509)

Inspect for damage or a broken tooth. Replace the input shaft assembly (509). Refer to Forward Clutch Assembly Disassemble .

Input shaft assembly (509) pinion gear thrust washers

Inspect for damage or wear - causing excessive end play and interference with other components. Replace the input shaft assembly (509). Refer to Forward Clutch Assembly Disassemble .

Sun gear (505)

Inspect for worn or broken teeth. Replace the sun gear (505). Refer to Forward Clutch Assembly Disassemble .

Forward and reverse clutch valve train

Inspect for:

    • Worn or stuck valve (304)
    • Worn, sticking or damaged spring (303)
    • Damaged or incorrectly installed bore plug retainer (300)
    • Worn or damaged bore plug (301)
    • Missing or cut bore plug seal (302)

Refer to Control Valve Body Assembly Disassemble .

Manual valve (202)

Inspect for wear, sticking or binding. Replace the manual valve (202). Refer to Control Valve Body Assembly Disassemble .

Line 1 pressure regulator valve (316)

Inspect for wear, sticking or binding. Replace the line 1 pressure regulator valve (316). Refer to Control Valve Body Assembly Disassemble .

Line 2 pressure regulator valve train

Inspect for:

    • Worn, sticking or binding valve (212)
    • Worn, sticking or damaged spring (211)
    • Missing or cut bore plug seal (210)

Refer to Control Valve Body Assembly Disassemble .

Line limit valve (310) and spring (309)

Inspect for wear, sticking, binding or damage. Refer to Control Valve Body Assembly Disassemble .

Actuator feed limit valve (312) and spring (311)

Inspect for wear, sticking, binding or damage. Refer to Control Valve Body Assembly Disassemble .

Variable ratio control valve lever assembly (317) and spring (318)

Inspect for wear, sticking, binding or damage. Refer to Control Valve Body Assembly Disassemble .

Control valve body spacer plate (204)

Inspect for worn or plugged fluid passages. Replace or flush the spacer plate (204). Refer to Control Valve Body Assembly Disassemble .

Control valve body (305)

Inspect for clogs with debris or sediment. Replace or flush the control valve body (305). Refer to Control Valve Body Replacement .

Control solenoid valve assembly (201)

Inspect for clogs with debris or sediment. Replace the control solenoid valve assembly (201). Refer to Control Valve Body Replacement .