The Sierra 18-2204 Upper Unit Gear Set contains parts that are built with precision. Designed to be interchangeable with the following: GLM 11230, Mercruiser 43-75324A2 and 43-75325A3. Each Sierra product meets or exceeds the original equipment part it replaces. Drive Gear: 17 Teeth. Driven Gear: 19 Teeth. For: V-6 & 470/485 (4 cyl. etc.) and Gen II (s/n 0K999999 & Below).
Sierra Upper Unit Gear Set
Meets or exceeds the original equipment quality
Built with precision
Interchangeable with the following: GLM 11230, Mercruiser 43-75324A2 and 43-75325A3
Fit specific, check part numbers to ensure proper fit