Turn the ignition to run
Depress the accelerator to the floor.
Slowly release the pedal.
Repeat 2 more times (total of 3)
Turn the key to off.
Start the engine and let it idle for 5 minutes (don't touch the accelerator)
Turn the engine off.
Start it back up and test drive. If you have the same problem I had, now is when you smile really big while you realize there's nothing wrong with your tranny and you just fixed your truck for free