GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Control Valve Upper Body Assembly (304)

    • Inspect for worn, damaged, or sticking 3-5 reverse regulator valve (336) and valve spring (326).
    • Inspect for damaged or missing #5 checkball.

Control Valve Lower Body Assembly (307)

Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).

4-5-6 (with Turbine Shaft) Clutch Assembly (56)

    • Inspect for damaged 4-5-6 clutch (with turbine shaft) housing assembly (441).
    • Inspect for damaged or distorted turbine shaft.

1-2-3-4 Clutch (with Output Carrier Inner Sun Gear Shaft) Hub Assembly (61)

Inspect for damaged or distorted shaft on hub assembly.

2-6 and 3-5-R Clutch (with Output Carrier Outer Sun Gear Shaft) Hub Assembly (64)

    • Inspect for damaged or distorted shaft on hub assembly.
    • Inspect the output carrier inner sun gear shaft bushings (60 and 62) for damage or wear.

Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)

    • Inspect for damaged or worn low and reverse clutch plates (463 and 465).
    • Inspect for damaged low and reverse clutch backing plate (462). Inspect for worn splines on backing plate.
    • Inspect for damaged low and reverse clutch backing plate retaining ring (461).
    • Inspect for damaged low and reverse clutch piston assembly (470), spring (469), spring retaining ring (466), and center support assembly (459).
    • Inspect for damaged low clutch sprag assembly (467). Holding the sprag assembly with the retaining ring facing up, and the inner race of the sprag assembly fixed, the outer race should freewheel counterclockwise.
    • Inspect for cut, worn, or damaged low clutch sprag seal (468).
    • Inspect for worn or damaged output carrier outer sun gear shaft front and rear bushing (458 and 460).

Output Carrier Assembly (68)

    • Inspect for damaged or stripped splines on the output carrier assembly.
    • Inspect for a worn or damaged center support roller bearing assembly (485).

1-2-3-4 and 3-5-R Clutch Assembly (51)

    • Inspect for improper selective 3-5-R clutch backing plate retaining ring (400).
    • Inspect for improper selective 1-2-3-4 clutch backing plate retaining ring (429).
    • Inspect for worn or damaged clutch bearing (428).
    • Inspect for damaged or worn 3-5-R clutch plates (402-404).
    • Inspect for damaged 3-5-R clutch piston (421), apply ring (405), and spring (420).
    • Inspect for cut, worn, or damaged 3-5-R clutch piston dam O-ring seal (418), inner seal (419), and outer seal (422).
    • Inspect for damaged 3-5-R clutch backing plate (401). Inspect for worn splines on the backing plate.

Center Support Retaining Ring (66)

Inspect for damage.

2-6 and 3-5-R Clutch Hub Thrust Bearing Assembly (65)

Inspect the bearing for wear or damage.

Center Support Fluid Passage Seal Assembly (20), A/trans Fluid Pump Seal Assemblies (18 and 19)

Inspect for cut, worn, or damaged seals.

Torque Converter Housing with Fluid Pump Assembly (2)

    • Inspect for worn, sticking, or damaged pressure regulator valve (233).
    • Inspect for worn, sticking, or damaged pressure regulator valve outer spring (234).
    • Inspect for worn, sticking, or damaged pressure regulator valve inner spring (235).
    • Inspect for worn, sticking, or damaged isolator valve (236) and sleeve (237).
    • Inspect for worn, sticking, or damaged pressure relief ball valve (225).
    • Inspect for worn, sticking, or damaged pressure relief ball valve spring (224).
    • Inspect for damaged or porous pump cover assembly (219). Inspect for pump surfaces not flat.
    • Inspect for excessive fluid pump rotor (217) clearance or damage. Ensure proper selective rotor is being utilized.
    • Inspect for damaged fluid pump slide (212). Ensure proper selective slide is being utilized.
    • Inspect for worn, sticking, or damaged fluid pump slide outer spring (211).
    • Inspect for worn or damaged fluid pump slide seal (213), seal support (214), pivot pin (215), fluid seal ring (209), and O-ring seal (210).
    • Inspect for worn or damaged fluid pump vane rings (207) and rotor guide (208).