TRANSMISSION TROUBLESHOOTING
Below is a comprehensive list of the frequently asked questions we receive via our email contact form.

TRANSMISSION STARTS OFF IN SECOND GEAR, WON’T SHIFT ON ITS OWN, BUT YOU CAN SHIFT IT MANUALLY (4L60E/80E)?
•    Ensure that your transmission plug is inserted fully and in the correct orientation into the transmission. Check the transmission for bent or broken pins in the connector.
•    Contact PSI Tech Support to ensure that the tune in your PCM is correct for your application.

TRANSMISSION STARTS IN FIRST AND THEN SHIFTS INTO NEUTRAL (4L60E/80E)?
•    Ensure that your transmission plug is inserted fully and in the correct orientation into the transmission. Check the transmission for bent or broken pins in the connector.
•    Ensure that your transmission is filled to the correct fluid level.
•    Contact PSI Tech Support to ensure that the tune in your PCM is correct for your application.


WHAT YEAR IS MY 6L80E TRANSMISSION
?
•    There is an ID tag on the side of the transmission which can be decoded with the identifier below.
6L80E Trans Decoder

WHAT ARE THE DIFFERENCES BETWEEN THE VARIOUS 4L60E/4L65E/4L70E TRANSMISSIONS?
•    GM started making the 4L60E automatic overdrive transmission in the early 1990’s in various configurations. Mechanically there are various differences which will affect strength and longevity, while electrically there are slight differences. For the purposes of using with the LS PCM there are some compatibility issues you must be aware of. For Gen III (24X) engine applications the transmission must be newer than 1996. This can be identified by counting the metal pins sticking up from the round electrical connector on the transmission. There should be 13 pins in the electrical connector. If you are using a Gen IV (58x) engine, the preferred transmission would be from a 2005 or newer application. This can be identified by counting the metal pins sticking up from the round electrical connector on the transmission. There should be 15 or 17 pins in the electrical connector. An earlier transmission (13 Pin) can be used as well, but requires changes made to the ECM/TCM tune.
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