GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Forward clutch plates (515, 516)

Inspect for wear - causing slow clutch apply. Replace the forward clutch plates (515, 516). Refer to Forward Clutch Assembly Disassemble .

Forward clutch piston assembly (501)

Inspect for cut or rolled seals. Replace the forward clutch piston assembly (501). Refer to Forward Clutch Assembly Disassemble .

Transmission fluid pump assembly (23)

Inspect for internal damage - causing low or no pressure at the discharge port. Replace the fluid pump assembly (23). Refer to Transmission Fluid Pump Disassemble .

Fluid filter assembly (26)

Inspect filter for clog, looseness or improper sealing. Replace the fluid filter assembly (26). Refer to Fluid Filter Removal .

Shaft splines on the variable drive pulley assembly (500)

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 damage. Replace the variable drive pulley assembly (500). Refer to Forward Clutch Assembly Disassemble .

Elements on the 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. Replace the variable drive belt assembly (107). Refer to Drive Belt Removal .

Bolts (19, 20) securing the transmission fluid pump assembly (23) to the case

Inspect for loose or stripped bolts. Tighten or replace the bolts (19, 20). Refer to Transmission Fluid Pump Removal .

Line 1 pressure regulator valve train

Inspect for:

    • Worn, sticking or binding valve (316)
    • Worn, sticking or damaged spring (315)
    • Missing or cut bore plug seal (302)

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 .

Control valve body (305)

Inspect for porosity, damage, or contamination with debris. Replace or flush the control valve body (305). Refer to Control Valve Body Replacement .