GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Leak at Bottom Pan

  • Bottom Pan

Damaged or not flat

  • Bottom Pan Gasket

Damaged or off location

  • Bottom Pan to Case Bolts
    • Flange inside out, damage
    • High or low torque
  • Case

Porosity or cracked

Leak at Case Extension

  • Case

Porosity or cracked

  • Case Extension

Porosity or cracked

  • Case Extension to Case Bolts
    • Low torque
    • Missing
  • Case Extension to Case Seal
    • Cut or nicked
    • Missing

Leak at Converter Seal

  • Converter Hub Seal Assembly
    • Cut, nicked or worn
    • Missing garter spring
  • Torque Converter Bolt
    • Low torque
    • Damaged hub

Leak at Cooler Connectors

  • Case
    • Stripped threads
    • Porosity
    • Debris in threads
  • Cooler Connectors
    • Stripped threads
    • Seal damage
    • High or low torque
    • Quick connect loose; not locked

Leak at Drive Axle Seal

  • CV Joint

Corrosion on Tri-Pot housing at mating surface

Leak at Electrical Connector

  • Case

Porosity or cracked

  • Electrical connector
    • Damaged or not seated
    • Cut or nicked
    • Missing, porosity
  • O-Ring Seal
    • Damaged or not seated
    • Cut or nicked
    • Missing, porosity

Leak at Fluid Fill Indicator

  • Seal on Indicator
    • Cut or nicked
    • Missing

Leak at Manual Shaft

  • Linkage

Misadjusted

  • Manual Shaft Seal
    • Cut or nicked
    • Not seated

Leak at Vehicle Speed Sensor

  • Vehicle Speed Sensor O-Ring Seal

Cut, nicked or missing