General Information

Automatic Transmission:

The 4-speed overdrive automatic transmission, the Hydra-Matic 4L60-E (RPO M30), has two identifying stampings or laser etchings.

Automatic Transmission ID Number Location:

The transmission identification (ID) number indicates the transmission model type and when the unit was built. The transmission ID number is located on the bottom of the case just rear of the oil pan.

For a description of the RPO Code(s) shown in this article/image, refer to the RPO Code List found at Vehicle/Application ID. RPO Codes