For 1.98:1 Ratio Drives.
Drive Gear = 20 teeth; Driven Gear = 24 teeth.
For 120/140 (S/N 2791957 & UP) and Gen II (S/N K999999 & Below)
Interchangeable with:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-6353 Upper Gear Kit Sierra replacement upper gear kit for Mercruiser Vazer, and Alpha I Gen II 1998 & Up (s/n 0L00040 & up) Interchangeable with: GLM 11238 Mercruiser...
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Gen II & Vazer (1.94:1 & 2.40:1 Ratios) Upper Gear Set For Alpha Gen II and Vazer 1.94:1 and 2.40:1 Ratios (20 - 24 Teeth) Used with 18-2411 Drive Shaft Housing Assembly and 18-2419 Complete Upper...
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Sierra 18-2201 Mercruiser 1.5:1 Upper Unit Gear Set Sierra replacement engine parts are designed to meet OEM specifications. 18-2201 Upper Unit Gear Set is for most V8 Drives and Gen II (S/N K999999...
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Sierra 18-2259 Mercruiser 1.98:1 Upper Gear Kit Sierra high-quality engine parts are designed to meet OEM specifications. For 4 Cylinder Engines (120/140) with a 1.98:1 Gear Ratio. Drive Gear: 20...
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Sierra 18-2257 Mercruiser 1.65:1 Upper Gear Kit Sierra replacement Upper Gear Kit for Mercruiser Inline 6 Cylinder Engines with a 1.65:1 Gear Ratio. Ratio: 1.65:1 Driver Gear: 24 teeth Driven...
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Sterndrive Engineering SE106 Replacement Mercruiser Drive R, MR, Alpha One Complete Replacement Outdrive for Mercruiser R, MR, and Alpha One. 1972 - 1990. Please verify your serial number to be sure...
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