Before installing your transmission, attach your shift handle to the shift stub and make sure that the shifter can be moved into all gears properly. It's possible that the shift forks could have been knocked out of alignment during shipping. This is very rare, but important to check. It's easily correctable before the transmission is installed. Place the shifter stub in neutral and remove the shifter from the transmission by removing the four bolts securing the shifter to the tailshaft. Remove the shifter and set it aside. Apply masking tape over the shifter cavity to prevent dirt from entering the transmission during installation.