GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Front differential carrier assembly (32)

Inspect for:

    • Damage to the assembly (32)
    • Broken teeth on the front differential side gear (605) and pinion gear (606)
    • Fractured front differential pinion shaft (603)

Refer to Front Differential Carrier Disassemble .

Park pawl shaft hole plug (33) and actuator guide pin (34)

Inspect for missing plug, - causing the actuator guide (42) to become inoperative. Install a NEW park pawl shaft hole plug (33) and actuator guide pin (34). Refer to Manual Shift Shaft and Parking System Components Removal .

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 .

Manual shift shaft and parking system components

Inspect for:

    • Damage, worn or rounded teeth on the manual shaft detent lever (45)
    • Binding, bent or damaged park pawl actuator assembly (43)
    • Broken or distorted spring on the park pawl actuator assembly (43)
    • Damaged manual shift shaft (40)
    • Damaged park pawl reaction pin (35) or spring (37)
    • Damaged or stuck park pawl  (36)
    • Loose or stripped manual shift shaft nut (46)

Refer to Manual Shift Shaft and Parking System Components Removal .

Manual valve (202)

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