[ Attachment Invalid Or Does Not Exist ]   I am a MerCruiser Master TECH. I need to know what drive you have, there is I, R, MR, Alpha One, Alpha One SS. Drive SER# or year will tell me. I also need to know ENG.TYP. In line 4 In line 6 or V8. Wait theres more, Is the shift control mounted to the back of the ENG, Side of the ENG or the exhauet manifold. There is a deferent adjustment for each one.Thees drives also have a reverse trim lock valve & shift cutout switch that is part of this adjustment. Get back with me and i will try to walk you threw it Scooter.