hi jim, i put one on last year.... i LOVE it...when i push Hard on the throttle the motor Jumps to 4300rpm,+ stays there..in the mean time the boat is Violently trying to Catch Up.!! i run a 4.3l merc.alpha1...in an old restored '74 Starcraft 210 Islander(bitch'n Lake O fishing machine)the Low gear will let me troll at 1000rpm/1.7-2mph, OR Rip the arms Off a skier,if your not careful.....that was last year with a 1.5/1 ratio outdrive...i've since Ywacked that one...Now have a 1.65/1 alpha1,+ hope to have my torque shift back this week....last year i had the upshift limited to about 18" with the 1.5/1....i'm thinking i should be able to back the screws off a bit, to around 20"-21" with this 1.65/1......if this works out right, i've got another outdrive with the 1.98/1 gears in it.....turn the screws a bit more,+ the torque should be "gut wrenching,seat busting,transom cracking,.....no matter where i set the screws with this prop, low gear is 11" of pitch.....Tight Lines Bondo