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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Sierra 18-2204 Mercruiser 1.84:1 Upper Unit Gear Set For 1.84:1 Ratio Drives. Drive Gear = 17 teeth; Driven Gear = 19 teeth. For V6 and 470/485 (4 cyl. etc.) and Gen II (S/N K999999 &...
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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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Mercruiser 1.65:1 Ratio Upper Unit Gear Set Replaces: Mercury 43-45814A5 GLM 11220 Sterndrive 91-104-01CK 1.65:1 ratio. Drive gear = 24 teeth, driven gear = 24 teeth For 6 cyl inline
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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 18-2363 Mercruiser 1.98:1 Upper Unit Gear Repair Kit Sierra Upper Unit Gear Repair Kit is for use on Mercruiser Gen II applications s/n range up to 0K999999 only. Ratios: 1.98:1 (1.94:1/2...
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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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Sierra 18-1601 Upper Gear Kit Sierra replacement upper gear kit for OMC Stern Drives. For: 5.0L V-8 engines-Cobra drives (21:18 ratio) Interchangeable...
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Mercruiser 1.5:1 Upper Gear Kit by Sierra For Most V8 Drives with a 1.5:1 Ratio. Kit Includes: 18-2201 - Upper Unit Gear Set 18-2648 - Seal Kit 18-2619-1 - Outdrive Gasket Set 18-2820 - Drive...
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