4L60E , 4L65E Transmission - New Design Oil Pump Seal (Oil Pump to Case ) - kwautomatic leak oil DTCslip shift

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

General Motors Powertrain (GMPT) has made a design change to oil pump to case oil seal on the 2004 4L60E (M30) and the 4L65E (M32). The new seal is a stamped molded seal and replaces the o-ring style seal previously used. The two seals are not interchangeable. Listed below are the service related items for the new design stamped molded seal. The new seal is being phased into production starting in March of 2004

When servicing transmissions with the new seal, use following precautions:

1. The outer diameter of the pump assembly and case bore must be clean and free of burrs or raised surfaces. Be aware of sharp edges that could damage the seal during installation.
2. The seal should be clean and dry before installation. It does not require lubrication for installation.
3. The seal should be inspected prior to installation for obvious damage.
4. It is preferable to hand-start the seal positioning the seal evenly around the case bore before installing the torque converter housing.
5. The seal can be easily removed by prying it out, typical of a pressed-on seal.
6. The seal may be reused, however a through inspection must be performed. Inspect the seal for:

*Distortion of metal carrier or separation from the rubber seal

*Cut, deformed, or damaged seal.

7. The new stamped molded oil pump to case will not service transmission produced prior to the design change, nor will the previous o-ring style seal work in place of the stamped molded seal.
8. The new stamped molded seal requires that the oil pump be installed and torqued prior to installing the molded seal. The molded seal is seated into position by installing and torquing the torque converter housing.

A informational TSB is in process and SI is being updated to include the new service procedures for the new stamped molded oil pump to case seal.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(04 All General Motors Light Duty Trucks) and (04 Chevrolet Corvette) and (04 Pontiac GTO)

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