Sterndrive Replacement has the expertise to find you some Mercury Outboard Lower Unit Shift Shaft Kit to convert 70-115 HP motors from a 3 jaw lower unit to a 6 jaw lower unit at the most surprising prices on the market. Because we are the Number One reference in marine products, we can provide you with some products that are at the lowest prices available anywhere else. Our website provides easy access and transactions are fully secured.
2006 and up models may use a shif shaft system. The easiest way to identify it is by the amount of shift shaft sticking out from the shift bushing. If it measures 7/8 or 5-7/8, our unit will work. If the measurements are 3/4 inch long, our unit will not work. In the late 90’s, Mercury marine made a change to metric in line gear case.
The reverse gears and clutches were changed from 3 jaw to 6 jaw engagement. As a result, the distance between the forward and reverse gears increased. The existing shift linkage could not account for the increased clutch travel needed. The shift shaft and the linkage in the mid section were redesigned to compensate.
When replacing a 3 jaw gear case with a 6 jaw gear case, the shift shaft and linkage must be replaced. SEI parts number SEI-92-205-07K has a shift shaft and link as well as applicable bushing and nuts. Since the powerhead needs to be removed to replace the shift shaft in the mid section, our kit also includes a new powerhead base gasket. It is a universal kit that includes two powerhead gaskets, so use only the appropriate one for your motor.
This kit will work for 75 HP-125 HP. Tiller models do not require any modifications.
The OE case marking for 3- or 6-jaw units. You will notice on the 6 jaw units that there is a 45 degree machined line just forward of the trim tab bolt hole. A 3 jaw case will not have a 45 degree line. All SEI units are 6 jaw; however, they do not have a 45 degree machined line.