Automatic Transmission Fluid Leaks

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Cause
Oil Pan Fluid Leak
Oil Pan (28)	The pan is damaged or the pan is not flat.
Gasket (29)	Damaged or mispositioned
Case (7)	Porosity or cracked
Bolt (27)	The flange is inside out. High or low torque
Fill Tube Fluid Leak
Seal	Cut or nicked Missing
Case (7)	Porosity
Fill Tube	Damaged at the case end Not seated in the case
Brackets	Out of position, causing tension on the fill tube
Electrical Connector Fluid Leak
Electrical Connector	Damaged, or not seated
O-ring Seal	Cut or nicked Missing
Case (7)	Porosity or cracked
Cooler Connector Fluid Leak
Cooler Connectors (8)	Stripped threads Damaged flare High or low torque
Case (7)	Stripped threads Porosity Debris in the threads
Case Extension Fluid Leak
Case Extension (19)	Porosity or cracked
Case (7)	Porosity or cracked
Seal (15)	Cut or nicked Missing
Bolt (21)	Low torque Missing
Manual Shaft Fluid Leak
Seal (707)	Cut or nicked Not seated
Linkage	Misadjusted
Pump Body Seal Fluid Leak
Seal (201)	Cut, nicked, or worn Missing garter spring
Torque Converter (1)	Damaged hub
Bolt	Low Torque
Vehicle Speed Sensor Fluid Leak
Seal	Cut, missing, or nicked
Vehicle Speed Sensor Assembly (22)	Damaged Not seated Damaged bracket
Bolt (23)	Low torque Missing Damaged threads
Case (7)	Porosity or cracked
Output Shaft Seal Fluid Leak
Seal (20)	Cut or nicked
Case (7)	Porosity or cracked
Line Pressure Plug Fluid Leak
Plug (24)	Stripped threads Low or high torque
Case (7)	Porosity or cracked Damaged threads