Possible Points of Fluid Leaks

Torque Converter Housing (150)

• The torque converter housing to transmission case housing is improperly torqued.
• The torque converter sealing surface is damaged.
• the torque converter housing gasket (68) is missing, improperly installed or damaged.
• The front wheel drive shaft oil seal (117) is missing, worn or damaged, or there is a housing sealing surface concern.
• The transfer case input shaft seal is missing, worn or damaged, or there is a sealing surface concern.
• The automatic transmission fluid case plug (120,144) is loose or the 8 mm sealing washer (121, 143) is missing or damaged.
• The torque converter seal (116) is damaged, missing, or there is a sealing surface concern.
• The torque converter housing porosity

Transmission Case Housing (31)

• Manual shift shaft seal (41) is damaged, missing, or there is a sealing surface concern
• Clutch pressure control solenoid cover (84) is improperly torqued, or there is a sealing surface concern
• Clutch pressure control solenoid cover gasket (82) is missing, improperly installed or damaged
• Fluid level indicator tube, O-ring seal (38) is missing, worn, damaged, or there is a sealing surface concern
• 3rd clutch fluid pressure sensor (25) is loose or the 10 mm sealing washer (4) is missing, or there is a sealing surface concern
• 4th clutch fluid pressure sensor is loose or the 10 mm sealing washer (4) is missing, or there is a sealing surface concern
• Input speed sensor O-ring seal (27) is missing, worn, damaged, or there is a sealing surface concern
• Output speed sensor O-ring seal (27) is missing, worn, damaged, or there is a sealing surface concern
• Automatic transmission fluid temperature sensor O-ring seal (23) is missing, loose, or there is a sealing surface concern
• Fluid fill plug (79) is loose, missing, or the 24 mm sealing washer (80) is missing, damaged, or there is a sealing surface concern
• Automatic transmission wiring harness O-ring seal (3) is missing or damaged, or there is a sealing surface concern
• TCC lock-up pressure control solenoid (7) is improperly torqued or there is a sealing surface concern
• TCC lock-up pressure control solenoid gasket (12) is missing or damaged, or there is a sealing surface concern
• Automatic transmission clutch pressure control solenoid valve assembly (18) is improperly torqued or there is a sealing surface concern
• Automatic transmission clutch pressure control solenoid gasket (20) is missing, improperly installed or damaged
• Mainshaft rear case cover (98) is improperly torqued, improperly installed, or there is a sealing surface concern
• Mainshaft rear case cover O-ring seal (99) is missing or damaged
• Transaxle oil cooler pipe fitting(s) (50) are loose or there is a sealing surface concern
• Transaxle oil cooler sealing washer (XX) is missing, damaged, or there is a sealing surface concern
• Transmission fluid drain plug (104) is loose or there is a sealing surface concern
• Transmission fluid drain plug 18 mm sealing washer (105) is missing, damaged, or there is a sealing surface concern

Fig 1: Possible Fluid Leak Points

Courtesy of GENERAL MOTORS CORP.