Upper Gear Kit 

Additional Details:

• Ratio: 1.50:1
• Fits: R, MR, Alpha One & SS (1983-1990)
• Drive Gear: 22 teeth
• Driven Gear: 20 teeth

Interchanges/Replaces

GLM

• 11215

Mallory

• 9-79202

Mercruiser Stern Drive

• 43-803116T1
• 43-803117T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-1142	GLM 21560 Mercruiser Stern Drive 31-32573A1	1	Upper Pinion Bearing		N/A
18-1160	GLM 21520 Mallory 9-75123 Mercruiser Stern Drive 31-35988A12 31-35988A2	1	Drive Bearing Kit		N/A
18-1165	GLM 21510 Mallory 9-75117 Mercruiser Stern Drive 31-61100A1	1	Tapered Roller Bearing		N/A
18-2201	GLM 11210 Mercruiser Stern Drive 43-18410A2 43-18411A2 43-59832A2 43-59832A4	1	Upper Unit Gear Set		N/A
18-2619-1	GLM 39620 Mallory 9-62601 9-62601-25 Mercruiser Stern Drive 27-64818A2 27-64818A3 27-94996 27-949962 27-94996A1 27-94996A2 27-94996Q2	1	Outdrive Gasket Set		N/A
18-2648	GLM 87500 Mallory 9-74303 Mercruiser Stern Drive 26-32511A1 26-32511B1	1	Upper Unit Seal Kit		N/A
18-2820	Mercruiser Stern Drive 27-45821 27-64818 27-64818A1 27-64818A20 27-64818A4 27-64818Q4	1	Outdrive Gasket		N/A