Upper Gear Kit 

Additional Details:

• Upper Gear Kit Ratio: 21:16

Interchanges/Replaces

GLM

• 22520

OMC Stern Drive

• 983825

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-1170	Chrysler/Force/US Marine 31-812767A1 GLM 21541 Johnson/Evinrude Outboard 983892 Mercruiser Stern Drive 31-812767A1 Mercury Marine 31-812767A1 31-8M0103476 31-F506225 FA506225 OMC Stern Drive 983892	1	Lower Pinion Bearing		N/A
18-1171	GLM 21543 OMC Stern Drive 983878	1	U-Joint Shaft Bearing		N/A
18-1172	GLM 21542 OMC Stern Drive 983877	1	Carrier Bearing		N/A
18-1161	GLM 21540 Johnson/Evinrude Outboard 983891 Mallory 9-75122 Mercruiser Stern Drive 31-35990A1 OMC Stern Drive 983891	1	Tapered Roller Bearing		N/A