Extreme Shift Cable Tool | Sierra 18-9806E Sierra Extreme Shift Cable Tool | 18-9806E Special tool for removing intermediate shift cables from Mercruiser #1, R, MR, Alpha I, & Gen II stern drives. Sierra shift cable tool Installs and removes shift cables on Mercruiser MC-I, R-MR, Alpha I, Alpha I Gen II stern drive units For use with Sierra 18-2190 and 18-2190E aft entry cables Can also be used on older FWD entry cables Replaces Mercury 91-12037 Replaces Mallory 9-79806 Replaces Sierra 18-9806