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Transmission relearn method...
No idea why this isn't a sticky..
You could just drive around 200 miles and the transmission will learn but to ensure all is taken care of and after this you are still having hard shifts you might want to add 1/2 to full qtr. It might overflow but that will cause no problems beside a transmission fluid puddle on the driveway..
Go 0-80 mph at 25% throttle,
Go 0-80 mph at 50% throttle,
Go 0-80 mph at 100% throttle,
The transmission may seem to miss a gear or truck will depower on shift. This is normal and will happen a few times before the transmission will learn. After method above is performed the transmission has learned, this should not happen anymore.
Every time the truck is flashed, the learned memory is cleared and the
transmission will have to learn again.