Re: Lower unit

March 16, 2015 at 2:59 pm #12094

Anonymous

quote fleetwin:

Complete 10hp gearcases will swap out from 58-63 but be careful trying to mix/match parts between different gearcases, the driveshaffts and gears changes around 1960.

Yes, there was a mid-year change in 1960 (QD-21 vs QD-21S) that I think changed the drive shaft from keyed to splined, and lowered the tooth count on the gears so they are beefier.