There is a
detent spring that you should remove that will make the shift go much easier. If I remember correctly, you will have to take the clutch housing apart to get at it. You'll need a Torx bit to take off the three screws on the front retaining plate. I also remove the 5 anti-rotation pins that locks the output shaft when the drill is used with a keyless chuck. You'll find them behind the "D" thrust plate on the outside of the transmission (output side). Lightly press outward two white retaining plastic tabs to gain access. Your drive wheels will lock up if you don't remove these pins when you reduce power or stop.
