Id Nitro lowers with 1.78 gear

[skeg]

How does one id a Nitro lower unit with 1.78 gears?
Do all short shaft Nitros come with the 1.78?

[LittleCharger]

How does one id a Nitro lower unit with 1.78 gears?
Do all short shaft Nitros come with the 1.78?

Omc 3 cylinder 15" nitro case is 1.86

[skeg]

So does one is the gear without taking it apart?

[sharpeye Mike]

Put it in gear and spin the flywheel, count the revolution it takes for the prop shaft to spin one turn.
It will give you a good ball park figure.