Found a 4l60e that's supposed to be out of a cop car. I attached a picture of a tag I found on it. Anybody have any info on it. Google didn't help at all. Thanks

 

That is a SRTA Tag and does not always match the original Broadcast Code of the Transmission.
A SRTA Transmission is a GM replacement Transmission (rebuilt, and often from a different vehicle, originally).

The original Broadcast Code should be on the Case, but under the area where the Tail-Shaft Housing bolts on.