Possible Points of Fluid Leaks
4L60-E/4L65-EPossible Points of Fluid Leaks
Transmission Oil Pan
* Incorrectly tightened oil pan bolts
* Improperly installed or damaged oil pan gasket
* Damaged oil pan or mounting face
* Incorrect oil pan gasket
Case Leak
* Damaged or missing fill tube seal
* Mislocated fill tube bracket
* Damaged vehicle speed sensor seal
* Damaged manual shaft seal
* Loose or damaged oil cooler connector fittings
* Worn or damaged propeller shaft oil seal
* Loose line pressure pipe plug
* Porous casting
Leak at the Torque Converter End
* Converter leak in the weld area
* Converter seal lip cut. Check the converter hub for damage
* Converter seal bushing moved forward and damaged
* Converter seal garter spring missing from the seal
* Porous casting of the transmission case or the oil pump
Leak at the Vent Pipe or the Fluid Fill Tube
* Overfilled system
* Water or coolant in the fluid. The fluid will appear milky
* Transmission case porous
* Incorrect fluid level indicator
* Plugged vent
* Drain-back holes plugged
* Mispositioned oil pump to case gasket. if equipped
Part 1 Of 2:
Part 2 of 2:
Leak Inspection Points