I have a 1992 merc 150 xr6.it to has the smaller gear case also. 1.78:1 gear ratio.i discovered it had a crack in it.im having trouble finding a lower unit for it.i think I'm going to a 1.87:1 .bigger gear case
I was curious if I go from a 1.78:1 lower unit to a 1.87:1 lower unit will the drive shaft work in my motor.my 1.78 lower cracked.so I need a new lower unit.