Need to verify if tune file I downloaded is 4L80E

[BLK02WS6]

You can change whether the TCC stays locked during a shift or not via programming.

I know in some cases you can with the toggle that allows it, but this OS doesn't have the toggle - and based on the TPS/MPH, it should have stayed locked. I don't see why it is dropping in and out based on the settings.

[joecar]

I know in some cases you can with the toggle that allows it, but this OS doesn't have the toggle - and based on the TPS/MPH, it should have stayed locked. I don't see why it is dropping in and out based on the settings.

The stock trans tunes from GM all unlock the TCC during shifts.