GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Input shaft assembly (509)

Inspect for damage, wear or misalignment in the case. Replace the input shaft assembly (509). Refer to Forward Clutch Assembly Disassemble .

Input shaft, outer, bearing (510)

Inspect for damaged, seized or worn bearing. Replace the input shaft, outer, bearing (510). Refer to Forward Clutch Assembly Disassemble .

Input shaft fluid passage sleeve (508)

Inspect for obstruction or damage. Replace the input shaft fluid passage sleeve (508). Refer to Forward Clutch Assembly Disassemble .

Sun gear (505) and sun gear thrust washer (506)

Inspect for wear. Refer to Forward Clutch Assembly Disassemble .

Input shaft, inner, bearing (507)

Inspect for damaged, seized or worn bearing. Replace the input shaft, inner, bearing (507). Refer to Forward Clutch Assembly Disassemble .

Front differential carrier assembly (32)

Inspect for damage. Replace the front differential carrier assembly (32). Refer to Front Differential Carrier Assembly Removal .

Front differential side gear (605) and pinion gear (606)

Inspect for a broken tooth. Refer to Front Differential Carrier Disassemble .

Front differential pinion shaft (603)

Inspect for damage or fracture. Replace the front differential pinion shaft (603). Refer to Front Differential Carrier Disassemble .

Front differential pinion gear shaft pin (602)

Inspect for damage. Replace the front differential pinion gear shaft pin (602). Refer to Front Differential Carrier Disassemble .

Fluid pump seals (18, 25)

Inspect for cut or damage - causing leaking past the seal. Replace the fluid pump seals (18, 25). Refer to Transmission Fluid Pump Disassemble .

Control valve body bolts/screws (71, 79)

Inspect for loose, cross-threaded or stripped bolts. Tighten or replace the bolts/screws (71, 79).

Bearing retainer (100) for the variable drive pulley (93)

Inspect for damage or not holding - causing drive belt failure. Replace the bearing retainer (100). Refer to Case Cover Assembly Disassemble .

Bearing retaining ring (99) for the variable drive pulley (93)

Inspect for loose, damaged or ring not holding - causing drive belt failure. Replace the bearing retaining ring (99). Refer to Case Cover Assembly Disassemble .

Pump drive sprocket (30)

Inspect for worn or broken teeth - causing loss of hydraulic power from drive link failure. Replace the pump drive sprocket (30). Refer to Drive Sprocket, Driven Sprocket, and Drive Link Removal .

Pump driven sprocket (17)

Inspect for worn or broken teeth - causing loss of hydraulic power from drive link failure. Replace the pump driven sprocket (17). Refer to Drive Sprocket, Driven Sprocket, and Drive Link Removal .

Splines on the pump driven sprocket (17)

Inspect for wear or damage. Replace the pump driven sprocket (17). Refer to Drive Sprocket, Driven Sprocket, and Drive Link Removal .

Drive link assembly (15)

Inspect for stretched, worn or damaged chain links. Replace the drive link assembly (15). Refer to Drive Sprocket, Driven Sprocket, and Drive Link Removal .

Drive/driven pulley opening covers (104, 114)

Inspect for internal leaking and/or damage. Replace the drive/driven pulley opening covers (104, 114). Refer to Variable Drive Cover Replacement .

Drive/driven pulley opening covers seals (98, 102, 109, 113)

Inspect for leaking, cut or damage. Replace the drive/driven pulley opening covers seals (98, 102, 109, 113). Refer to Variable Drive Cover Replacement .

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 damage or broken belt. Replace the variable drive belt assembly (107). Refer to Drive Belt Removal .

Retainer on the variable driven pulley assembly (106)

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 retainer for damage or not holding - causing drive belt failure. Replace the variable driven pulley assembly (106). Refer to Case Cover Assembly Assemble .

Selective bearing retainer (111) for the variable driven pulley (106)

Inspect retainer for damage or not holding - causing drive belt failure. Replace the selective bearing retainer (111). Refer to Case Cover Assembly Assemble .

Pinion gear and/or transfer gear teeth on the front differential drive pinion gear assembly (9)

Inspect for broken or damaged teeth. Replace the front differential drive pinion gear assembly (9). Refer to Front Differential Transfer Gear Removal .

Forward clutch backing plate (517)

Inspect for wear, broken splines or damage. Replace the forward clutch backing plate (517). Refer to Forward Clutch Assembly Disassemble .

Retaining ring (519) for the forward clutch backing plate (517)

Inspect for damage, looseness, or not holding. Replace the retaining ring (519). Refer to Forward Clutch Assembly Disassemble .

Forward clutch plate assemblies (515, 516)

Inspect for worn splines or friction material. Replace the forward clutch plate assemblies (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 .

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

Forward clutch piston, Belleville, spring (502)

Inspect for damage. Replace the forward clutch piston, Belleville, spring (502). 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 transmission fluid pump assembly (23). Refer to Transmission Fluid Pump Disassemble .

Fluid filter assembly (26)

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

Stator shaft assembly (81)

Inspect for damage. Replace the transmission case assembly (50). Refer to Transmission Case Inspection .

Torque converter (1)

Inspect for:

    • Damaged lugs or sheared lug bolts
    • Worn or damaged internal hub splines

Refer to Torque Converter Assembly 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 .

Fixed bearing on the variable driven pulley assembly (106)

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 driven pulley assembly (106). Refer to Variable Driven Pulley Bearing Replacement .

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 .

Pump driven sprocket retaining ring (16)

Inspect for loose, damaged or ring not holding. Replace the retaining ring (16). Refer to Drive Sprocket, Driven Sprocket, and Drive Link Removal .

Line 1 pressure regulator valve train

Inspect for:

    • Worn, sticking or binding valve (316)
    • Worn, sticking or damaged spring (315)
    • Damaged or incorrectly installed bore plug retainer (300)
    • Worn or damaged bore plug (301)

Refer to Control Valve Body Assembly Disassemble .

Line limit valve (310)

Inspect if the component is stuck in the exhaust position. Replace the line limit valve (310) and flush the control valve body (305). 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 .

Manual valve (202)

Inspect for wear, sticking or binding. Replace the manual valve (202). 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 .

Forward and reverse clutch valve (304)

Inspect for wear, sticking or binding. Replace the forward and reverse clutch valve (304). Refer to Control Valve Body Assembly Disassemble .