Re: 66 45hp chrylser lower unit
Well now we can try to help you. Gearcases from the 35, 45, 50, 55Hp engine family will fit. Very early Chrysler/WestBend in 1965/66 i think, did not have a spline propshaft, but the case will fit the leg.
So you shall look for a gearcase from a 35Hp 1965-1975, 45Hp 1966-1984, 50Hp Chrysler/WestBend 1965-1966 and 55Hp 1967-1976.
The shiftrod can have different design. Think it had two different typs, one with threaded coupler between shiftrod lower and rod intermidiate and one typ with keypin coupler.
The gear ratio is the same for all gearcases from these engines.
