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
    â€¢ Flange inside out, damage
    â€¢ 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
    â€¢ Low torque
    â€¢ Missing
  • Case Extension to Case Seal
    â€¢ Cut or nicked
    â€¢ Missing

Leak at Converter Seal

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

Leak at Cooler Connectors

  • Case
    â€¢ Stripped threads
    â€¢ Porosity
    â€¢ Debris in threads
  • Cooler Connectors
    â€¢ Stripped threads
    â€¢ Damaged flare, seal damage
    â€¢ High or low torque
    â€¢ 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
    â€¢ Damaged or not seated
    â€¢ Cut or nicked
    â€¢ Missing, porosity
  • O-Ring Seal
    â€¢ Damaged or not seated
    â€¢ Cut or nicked
    â€¢ Missing, porosity

Leak at Fluid Fill Indicator

  • Seal on Indicator
    â€¢ Cut or nicked
    â€¢ Missing

Leak at Manual Shaft

  • Linkage

Misadjusted

  • Manual Shaft Seal
    â€¢ Cut or nicked
    â€¢ Not seated

Leak at Vehicle Speed Sensor

  • Vehicle Speed Sensor O-Ring Seal

Cut, nicked or missing