Howdy, D Orvino.<br /><br />Tell us you engine model number and what problem you are having. <br /><br />The mechanical shifting mechanism is quite simple once you get to the engine. The hydraulic shift and electric shift systems are a different story completely.<br /><br />There are several good Repair Manuals that cover the Johnson 75s of that period, but it is necessary that you have identified your engine and your shifting system correctly.<br /><br />Let us know so we can steer you better.<br /><br />Good luck.