You can determine the type of transmission from the 4 large alpha-numeric characters on the transmission's ID tag. The 1st position is the Year Model of the transmission. The 2nd and 3rd positions determine the model of the transmission (4L60E & 6L80E ect.) The 4th position tells us what transmission family it belongs to. Below is a sample ID Tag. ID Tag styles vary.

1. Model Year
2. Model Code
3. Transmission Family
4. Transmission Assembly
Number
5. Julian Date
6.Sequential Serial Number
7. Source Code
8. Broadcast Code
9. Bar Code
10. Transmission I.D.

Below are some of the Transmission Broadcast Codes that are common. Only Position 2/3/4 are list because the 1st position changes with the year. The number of Connector Pins is also listed.