My F150 has a harsh shift from 3-5 at light throttle. The truck has a Roush Supercharger and has the stock Roush Tune. The strange thing is that it doesn?t do it all the time. It shifts smooth in some occasions, yet it goes back to the harsh shift. It is only present when it?s half throttle or less. Any idea on how to fix the issue? Also not sure if this is only a Roush thing.
