Upper Unit Gear Set - 18-2205 - Sierra
Replaces OEM part #
- MERCURY MARINE 43-55778A3
- 120/140 (S/N 2791957 & UP) and Gen II (S/N K999999 & BELOW) with 1.98:1 Gear Ratio (Drive Gear = 20 teeth Driven Gear = 24 teeth).
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