Hi Don, Bondo<br /><br />Need your help to identify the correct part to replace.<br /><br />My upper drive output spline is worn. Is it part of the gear or is it the driveshaft (P/n 45-55796) that fits into the driven gear? <br /><br />Thanks.<br /><br />qystan<br /><br />Yep, have to replace the lower unit driveshaft as well....