once again which ratio

[tazzvon]

I am getting ready to purchase an se106. I have an 86/87 four winns with a 4 cyl. mercruiser. I believe it's either a 170 or 185 not positive. any idea which gear ratio I would need to be looking at?

[Tech Support]

You would need our 1.81 to 1 ratio drive. You can check your old upper to be sure. The old unit should have 17 and 19 tooth gears.

Tech Support

[tazzvon]

what is the difference between the 1.81 and the 1.81 old style?

[Tech Support]

The old style refers to the input shaft on the upper unit. Up to around 1983/1984 the input shaft was 8 1/8" long on 4 cyl and inline 6 motors. All units after that are 9 9/16" long. The measurement is from the end of the shaft to the shoulder behind where the gimbal bearing rides.

Tech Support