Another Ratio Question

[busdrvr320]

I have an 87 Ebko 19.5', with an inline four Mercriuser 165hp. I run a Ballistic 14 3/4 x 17 ss prop and have been happy with the performance.
My first question is what ratio would be the replacement for what I have now? And secondly, if I wanted to change ratios what could I expect in terms of performace changes.

[Tech Support]

Your present drive is most likely a 1.84 or 1.65 ratio. You can verify this by looking for the ratio stamped into the upper housing on the port side near the decal or read the ratio on the decal if legible. If nothing is legible you can count the teeth on the gears. A 1.84 has 17/19 and a 1.65 has 24/24. I would recommend staying with the same ratio as the factory does a good job of selecting the best one for the boat and motor.

Tech Support