[15 - 35 hp] 3” Gearcase • 15hp E-TEC H.O 2011 & Newer • 20hp (2 cylinder) 1984-1997 • 25hp (2&3 cylinder) 1984 & Newer • 25, 30hp (E-TEC) 2009 & Newer • 30hp (2 cylinder) 1984 & Newer • 35hp (2 cylinder) 1979-1983 • 35hp (3 cylinder) 1997-2001 Thru hub exhaust, 14 tooth spline