Where are my 4L80E gurus on here?? I am having an issue where my truck will accelerate just fine through the gears, shift into overdrive properly, only to kick back out of overdrive once getting up to about 50-55 MPH, then no matter what you do will not shift back into overdrive on it's own. Now, if you pull over to the side of the road, shut the engine off and power cycle the ignition, it will operate just fine again, this is an intermittent issue, it doesn't do it all the time, and when it does do it, like I said, you power cycle the ignition, it corrects itself. I have changed the fluid and filter as part of the troubleshooting process with no noted change in operation at this point, any ideas??