GM Service Manual Online
For 1990-2009 cars only

Leaks

Checks

Cause

Side Cover (53)

Cracks in the cover or the cover is not flat

Flanged Nuts (50)

Low torque

Bolt and Washer Assemble

Low torque

Side Cover Gasket (54)

Split gasket

Flanged Nuts (50)

High torque

Bolt and Washer Assemble

High torque

Inner Gasket (55, 59)

Split gasket

Flanged Nuts (50)

High torque

Bolt and Washer Assemble

High torque

Fluid Fill Tube

    • Cut seal
    • Case porosity
    • Bad bracket weld

Electric Connector (35)

Case porosity

O-Ring Seal (36)

Cut or nicked O-ring

Reverse Servo Cover (40)

Cracks or porosity

O-Ring Seal (41)

Cut or nicked O-ring

Forward Servo Cover (13)

Cracks or porosity

O-Ring Seal (14)

Cut or nicked O-ring

Case (3)

Porosity

Cooler Ball Check Assembly (28) and Cooler Pipe Fitting (29)

    • Stripped threads
    • Low torque or porosity in the case
    • Bad flare

Modulator Assembly (32)

Split or cracked seams

O-Ring Seal (33)

Cut or nicked O-ring

Case Extension (6)

Cracks or porosity

Extension Seal (8)

Cut or nicked seal

Right Hand Axle Seal Assembly (4) and Left Hand Axle Seal Assembly (409)

    • Cut, nicked or worn assembly
    • Missing garter spring
    • Worn bushing, which allows a leaking seal in the right axle

Manual Shaft Seal (806)

Cut or nicked seal

Converter Seal Assembly (525)

    • Cut, nicked or worn assembly
    • Missing garter spring

Speed Sensor Assembly (10)

Damaged housing

O-Ring Seal (11)

Cut or nicked seal

Parking Plunger Guide (809)

Porosity in the case

O-Ring Seal (810)

Cut or nicked seal