Lower Gear Housing 

Key Features:

• Includes tapered roller bearing for non-tractor 14/28 or 17/28 gears

Additional Details:

• Bore Size: 3.2635-3.2650
• For: MR/Alpha style

Interchanges/Replaces

GLM

• 18000

Mallory

• 9-79127

Mercruiser Stern Drive

• 1623-8951A15
• 1623-8951A27
• 1623-8951A37
• 1623-8951A5

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2244	Chrysler/Force/US Marine 10-79953 10-79953A2 10-F50109 F40109 GLM 22420 Mallory 9-72650 Mercruiser Stern Drive 10-28634 10-28634A1 10-79953 10-79953A2 10-79953Q04 10-79953Q2 816610A1 816610A2 Mercury Marine 10-20259 10-28634 10-28634A1 10-79953 10-79953A2 10-79953Q04 10-79953Q2	1	Drain Screw		N/A
18-7176	Chrysler/Force/US Marine 25-90011 25-F74305 F694555 F74035 F74305-1 GLM 81390 Mallory 9-76554 Mercruiser Stern Drive 25-896523 25-90011 Mercury Marine 25-896523 25-90011	1	O-Ring		N/A
18-6093	GLM 12702 Mercruiser Stern Drive 806105A1 97-806105 97-806105Q1 97-806105T1	1	Anode		N/A
18-2914	GLM 31010 Mallory 9-60034 Mercruiser Stern Drive 27-32433 27-856081 27-8M0090319 Mercury Marine 27-30603 27-32433 27-85608 27-856081 27-8M0090319	1	Water Pump Gasket		N/A
18-1143	GLM 21580 Mallory 9-75107 Mercruiser Stern Drive 31-36387A1 Mercury Marine 31-36387A1	1	Tapered Roller Bearing		N/A
18-2376	Mallory 9-72602 Mercruiser Stern Drive 73020A20 818763A10 818763A4	1	Carrier Bearing		N/A
18-2285	GLM 23220 Mercruiser Stern Drive 15-35931A1 15-47397A1 Mercury Marine 15-47397A1	1	Shim Set		N/A
18-7159	GLM 83440 Mallory 9-76544 Mercruiser Stern Drive 25-31534 25-48451 Mercury Marine 25-31534	1	O-Ring		N/A
18-1117	Chrysler/Force/US Marine 31-42647A1 31-F694057 GLM 21610 Johnson/Evinrude Outboard 387817 5007751 Mallory 9-75121 Mercruiser Stern Drive 31-42647 31-42647A1 Mercury Marine 31-42647A1 OMC Stern Drive 387817	1	Pinion Bearing		N/A
18-3199	GLM 21870 Mallory 9-78115 Mercruiser Stern Drive 93423 934231 934233	1	Water Pickup		N/A
18-3198	GLM 21880 Mallory 9-78114 Mercruiser Stern Drive 93424 934241 934243	1	Water Pickup		N/A
18-3197	GLM 12822 Mallory 9-78130 Mercruiser Stern Drive 10-67373 10-76156 Mercury Marine 10-76156	1	Water Pick-Up Insert Screw		N/A
18-2915	GLM 31020 Mallory 9-60035 Mercruiser Stern Drive 27-32434 27-856091 27-858524 Mercury Marine 27-30604 27-32434 27-85609 27-856091 27-858524	1	Water Pump Gasket		N/A
18-2919	GLM 31050 Mallory 9-60031 Mercruiser Stern Drive 27-426311 Mercury Marine 27-42631 27-426311	1	Water Pump Gasket		N/A
18-6011	Honda Outboard 41107-ZW1-003ZA Mercruiser Stern Drive 31640 316404 31640A1 97-31640Q4 Mercury Marine 31640 316403 316404 31640A1 31640A2 31640A4 31640B4 72436A1 97-31640Q4	1	Anode		N/A
18-2945	Chrysler/Force/US Marine 12-19183 F50556 F8077 F8186 Johnson/Evinrude Outboard 307552 Mallory 9-60101 9-60102 Mercruiser Stern Drive 12-19183 12-191832 12-191833 12-19183B 12-20260 12-20260B Mercury Marine 12-19183 12-191832 12-191833 12-20260	1	Drain Screw Gasket		N/A
18-6245	GLM 21740 Mercruiser Stern Drive 10-32470 Mercury Marine 10-32470 10-47580 10-74728	1	Anode Mounting Bolt		N/A
NSS	Mercruiser Stern Drive 10-806290	2	Screw (#10-32 x 5/8")	No Image	N/A
NSS	Mercruiser Stern Drive 11-45812 11-859124	1	Locknut	No Image	N/A