Sierra / Mallory

Additional Details:

• Drive Gear: 20 Teeth
• Driven Gear: 24 Teeth
• Ratios: 1.94:1, 2.40:1
• For: Alpha I (Gen II) (1998 & Up), 0L100040 & Up
• For: Mercruiser Vazer

Use With:

• 18-2411: Driveshaft Housing Assembly
• 18-2419: Complete Upper Unit Assembly

Interchanges/Replaces

Mercruiser Stern Drive

• 43-853642A2

Additional Details:

• Drive Gear: 20 Teeth
• Driven Gear: 22 Teeth
• Ratio: 1.47:1
• For: Alpha I (Gen II) (1998 & Up), 0L100040 & Up

Use With:

• 18-2416: Complete Upper Unit Assembly

Interchanges/Replaces

Mercruiser Stern Drive

• 43-853641A2

Interchanges/Replaces

OMC Stern Drive

• 315189

Additional Details:

• Fits: I, R, MR, Alpha One & Gen II w/ 1.50 ratio

Interchanges/Replaces

GLM

• 21560

Mercruiser Stern Drive

• 31-32573A1

Additional Details:

• Ratio: 1.47:1
• For: Gen II (1998 & Up) (s/n 0L100040 & Up)

Interchanges/Replaces

Mercruiser Stern Drive

• 43-803103T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-6351	Mercruiser Stern Drive 43-853641A2	1	Upper Unit Gear Set		N/A
18-1179	GLM 21511 Mallory 9-75106 Mercruiser Stern Drive 31-32575A1 31-32575T1 Mercury Marine 31-32575A1 31-32575T1	1	Tapered Roller Bearing		N/A
18-1156	Chrysler/Force/US Marine 31-30894A1 GLM 21820 Honda Outboard 91051-ZW1-003 Mallory 9-75118 Mercruiser Stern Drive 31-30894A1 Mercury Marine 31-30894A1	1	Foward Gear Bearing		N/A
18-3712	GLM 28330 Mallory 9-78107 Mercruiser Stern Drive 12-45810	1	Carrier Nut Washer		N/A
18-3713	Chrysler/Force/US Marine 11-F1920 F1348 F1881 GLM 28360 Mallory 9-78117 Mercruiser Stern Drive 11-22339 11-36084 11-97522 Mercury Marine 11-22339	1	Lock Nut		N/A
18-2644	GLM 87501 Mallory 9-74302 Mercruiser Stern Drive 26-88397A1	1	Upper Unit Seal Kit		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
18-2282	GLM 23261 Mercruiser Stern Drive 15-32563A1 Mercury Marine 15-32563A1	1	Shim Set		N/A
18-2292	GLM 23280 Mercruiser Stern Drive 15-35980A1	1	Shim Kit		N/A
18-2293	GLM 23270 Mercruiser Stern Drive 15-23097A1 15-36178A02 15-36178A1 15-39899A1	1	Shim Kit		N/A
NSS	Mercruiser Stern Drive 25-853649	1	Spacer, Bearing Cup	No Image	N/A

Additional Details:

• Ratios: 1.94:1 & 2.40:1
• For: Gen II (1998 & Up) (s/n 0L100040 & Up)

Interchanges/Replaces

Mercruiser Stern Drive

• 43-803106T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-6352	Mercruiser Stern Drive 43-853642A2	1	Upper Unit Gear Set		N/A
18-1179	GLM 21511 Mallory 9-75106 Mercruiser Stern Drive 31-32575A1 31-32575T1 Mercury Marine 31-32575A1 31-32575T1	1	Tapered Roller Bearing		N/A
18-1156	Chrysler/Force/US Marine 31-30894A1 GLM 21820 Honda Outboard 91051-ZW1-003 Mallory 9-75118 Mercruiser Stern Drive 31-30894A1 Mercury Marine 31-30894A1	1	Foward Gear 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
18-3712	GLM 28330 Mallory 9-78107 Mercruiser Stern Drive 12-45810	1	Carrier Nut Washer		N/A
18-3713	Chrysler/Force/US Marine 11-F1920 F1348 F1881 GLM 28360 Mallory 9-78117 Mercruiser Stern Drive 11-22339 11-36084 11-97522 Mercury Marine 11-22339	1	Lock Nut		N/A
18-2644	GLM 87501 Mallory 9-74302 Mercruiser Stern Drive 26-88397A1	1	Upper Unit Seal Kit		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
18-2282	GLM 23261 Mercruiser Stern Drive 15-32563A1 Mercury Marine 15-32563A1	1	Shim Set		N/A
18-2292	GLM 23280 Mercruiser Stern Drive 15-35980A1	1	Shim Kit		N/A
18-2293	GLM 23270 Mercruiser Stern Drive 15-23097A1 15-36178A02 15-36178A1 15-39899A1	1	Shim Kit		N/A
NSS	Mercruiser Stern Drive 25-853649	1	Spacer, Bearing Cup	No Image	N/A

Additional Details:

• Fits: Volvo SX Thru 2006

Interchanges/Replaces

OMC Stern Drive

• 3850594

Volvo Penta

• 3850594

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
NSS	Volvo Penta 3852052	1	Split Pin	No Image	N/A
NSS	Volvo Penta 3852317	1	Gasket	No Image	N/A
NSS	Volvo Penta 967344	1	O-Ring	No Image	N/A
NSS	Volvo Penta 3852279	1	Gasket	No Image	N/A
NSS	Volvo Penta 3852272	1	Seal	No Image	N/A
18-0175	GLM 81080 Mercruiser Stern Drive 25-26543 Mercury Marine 25-26543	1	O-Ring		N/A
18-7116	Chrysler/Force/US Marine 25-62704 25-F24342 GLM 81100 Johnson/Evinrude Outboard 303067 Mallory 9-43631 Mercruiser Stern Drive 25-62704 802206 Mercury Marine 25-20633 25-22174 25-62704 25-85148 802206 OMC Stern Drive 303067 3852045 Volvo Penta 3852045	1	O-Ring		N/A
18-7183	GLM 45080 Mallory 9-76557 OMC Stern Drive 3852320 925093 Volvo Penta 3852320 925093 975676	1	O-Ring		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	1	O-Ring		N/A
18-32882	OMC Stern Drive 3852315 Volvo Penta 3852315	1	Seal		N/A
18-25251	OMC Stern Drive 3852322 853858 853868 Volvo Penta 853868	1	Sealing Ring		N/A
18-2996	GLM 86300 Mallory 9-76508 OMC Stern Drive 3852560 911823 Volvo Penta 3852560	1	Outdrive Seal		N/A
18-4248	Johnson/Evinrude Outboard 311598 Mallory 9-60408 OMC Stern Drive 311598 3852105 Volvo Penta 3852105	1	Drain/Fill Plug Washer		N/A

Additional Details:

• For: 100-245 Stringer Units (1968-1972)

Interchanges/Replaces

GLM

• 87651

OMC Stern Drive

• 981799

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0939	GLM 33050 Johnson/Evinrude Outboard 315189 OMC Stern Drive 315189	1	Upper Gearcase Dipstick Gasket		N/A
18-2073	GLM 86090 OMC Stern Drive 313191 907967 981268 981587	4	Oil Seal		N/A
18-3111	GLM 86100 OMC Stern Drive 907774	1	Water Pump Shaft Seal		N/A
18-4248	Johnson/Evinrude Outboard 311598 Mallory 9-60408 OMC Stern Drive 311598 3852105 Volvo Penta 3852105	2	Drain/Fill Plug Washer		N/A
18-7103	GLM 81190 Johnson/Evinrude Outboard 308624 Mercruiser Stern Drive 25-29845 Mercury Marine 25-29845 OMC Stern Drive 308624	4	O-Ring		N/A
18-7107	GLM 82480 Johnson/Evinrude Outboard 313175 Mercruiser Stern Drive 25-67202 Mercury Marine 25-67202 OMC Stern Drive 313175	1	O-Ring		N/A
18-7121	GLM 82350 Mallory 9-76651 Mercruiser Stern Drive 25-35029 27-882613 802231 Mercury Marine 25-35029 OMC Stern Drive 308621	1	O-Ring		N/A
18-7134	Chrysler/Force/US Marine 25-20195 25-F40342 GLM 81120 Johnson/Evinrude Outboard 303059 339543 Mallory 9-76511 Mercruiser Stern Drive 25-20195 25-201951 Mercury Marine 25-20195 OMC Stern Drive 303059	1	O-Ring		N/A
18-7146	GLM 81220 Johnson/Evinrude Outboard 554545 Mallory 9-76539 Mercruiser Stern Drive 25-47632 25-864701 OMC Stern Drive 554545	1	O-Ring		N/A
18-7158	GLM 81160 Johnson/Evinrude Outboard 309731 310585 Mallory 9-76543 Mercruiser Stern Drive 25-30613 25-846357 Mercury Marine 25-30613 25-846357 OMC Stern Drive 310585 310967	1	O-Ring		N/A
18-7172	GLM 82360 Johnson/Evinrude Outboard 553126 Mallory 9-76552 Mercruiser Stern Drive 25-31305 Mercury Marine 25-31305 OMC Stern Drive 553126	1	O-Ring		N/A
18-7173	Chrysler/Force/US Marine 25-30224 GLM 82250 Johnson/Evinrude Outboard 310327 Mallory 9-76501 Mercruiser Stern Drive 25-30224 25-30224Q Mercury Marine 25-27018 25-30224 25-30224Q OMC Stern Drive 310327	1	O-Ring		N/A
18-7198	Chrysler/Force/US Marine 25-45710 GLM 81270 Honda Outboard 91353-ZW1-003 Mallory 9-76504 Mercruiser Stern Drive 25-45710 25-457101 Mercury Marine 25-45710 25-457101 OMC Stern Drive 308626	2	O-Ring		N/A
NSS	OMC Stern Drive 308592	2	Gasket, Cover	No Image	N/A
NSS	OMC Stern Drive 308592	2	Gasket, Cover	No Image	N/A

Additional Details:

• For: All Cobra (1986-1989)

Interchanges/Replaces

GLM

• 87654

OMC Stern Drive

• 984459
• 986364
• 987603

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0166	GLM 86620 OMC Stern Drive 911705	2	Grommet		N/A
18-0884	GLM 33910 OMC Stern Drive 911733	1	Water Cover Gasket		N/A
18-0911	GLM 34771 OMC Stern Drive 911698	1	Water Pump Base Gasket		N/A
18-2067	GLM 86530 OMC Stern Drive 911685	1	Oil Seal		N/A
18-2068	GLM 86610 OMC Stern Drive 3853655 911701 915702 916058	1	Oil Seal		N/A
18-2541	GLM 86630 OMC Stern Drive 911704	1	Rubber Seal		N/A
18-2916	GLM 34770 OMC Stern Drive 911702	1	Water Pump Housing Gasket		N/A
18-2918	GLM 34730 Mallory 9-62650 OMC Stern Drive 911836 915840	1	Outdrive Gasket		N/A
18-2996	GLM 86300 Mallory 9-76508 OMC Stern Drive 3852560 911823 Volvo Penta 3852560	1	Outdrive Seal		N/A
18-7107	GLM 82480 Johnson/Evinrude Outboard 313175 Mercruiser Stern Drive 25-67202 Mercury Marine 25-67202 OMC Stern Drive 313175	1	O-Ring		N/A
18-7116	Chrysler/Force/US Marine 25-62704 25-F24342 GLM 81100 Johnson/Evinrude Outboard 303067 Mallory 9-43631 Mercruiser Stern Drive 25-62704 802206 Mercury Marine 25-20633 25-22174 25-62704 25-85148 802206 OMC Stern Drive 303067 3852045 Volvo Penta 3852045	1	O-Ring		N/A
18-7138	GLM 83250 Mallory 9-76533 OMC Stern Drive 318717	2	O-Ring		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	2	O-Ring		N/A
18-7169	Chrysler/Force/US Marine 25-F24278 GLM 82380 Mallory 9-76551 Mercruiser Stern Drive 25-35984 25-70937 OMC Stern Drive 911686	1	O-Ring		N/A
18-7403	GLM 81280 Mallory 9-76567 OMC Stern Drive 909316	1	O-Ring		N/A
18-7407	GLM 82430 Johnson/Evinrude Outboard 911700 OMC Stern Drive 3852531 911700 Volvo Penta 3852531	1	O-Ring		N/A

Additional Details:

• For: Alpha I Gen II

Interchanges/Replaces

GLM

• 87501

Mallory

• 9-74302

Mercruiser Stern Drive

• 26-88397A1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2003	GLM 85030 Mallory 9-76102 Mercruiser Stern Drive 26-32080 26-36054 26-68493 26-823894 26-823894B	1	Oil Seal		N/A
18-2056	Chrysler/Force/US Marine 26-66302 GLM 85060 Mallory 9-76130 Mercruiser Stern Drive 26-37259 26-89237 26-96503 26-965031 Mercury Marine 26-56394 26-66302	2	Oil Seal		N/A
18-2715	GLM 12930 Mallory 9-78005 Mercruiser Stern Drive 24-17997A1	1	Check Valve Kit		N/A
18-2944	GLM 85140 Mallory 9-76512 Mercruiser Stern Drive 26-45577 26-455771 26-45577B 26-45577B1	1	Seal Ring Gasket		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
18-3289	Mercruiser Stern Drive 26-864319	1	Double Lip Seal		N/A
18-7117	GLM 82150 Johnson/Evinrude Outboard 303360 Mallory 9-76507 Mercruiser Stern Drive 25-35027 Mercury Marine 25-35027	1	O-Ring		N/A
18-7161	GLM 80420 Mallory 9-76546 Mercruiser Stern Drive 25-32546 Mercury Marine 25-32546	1	O-Ring		N/A
18-7169	Chrysler/Force/US Marine 25-F24278 GLM 82380 Mallory 9-76551 Mercruiser Stern Drive 25-35984 25-70937 OMC Stern Drive 911686	1	O-Ring		N/A
18-7420	GLM 82110 Mallory 9-76565 Mercruiser Stern Drive 25-21836 Mercury Marine 25-21836 Mercury Race Outboard 25-21836 Mercury Race Sterndrive 25-21836 Mercury Sport Jet 25-21836	2	O-Ring		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	2	O-Ring
18-2430	Mallory 9-60105 Mercruiser Stern Drive 26-830749 Mercury Marine 26-830749	1	Drain Screw Gasket		N/A
NSS	Mercruiser Stern Drive 26-88397	1	Seal	No Image	N/A

Additional Details:

• For: #1 Units (including Alpha)(Also fits 888 stern drive)

Interchanges/Replaces

GLM

• 87500

Mallory

• 9-74303

Mercruiser Stern Drive

• 26-32511A1
• 26-32511B1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0894	GLM 31150 Mallory 9-60037 Mercruiser Stern Drive 27-55810 27-558101	1	Water Pocket Cover Gasket		N/A
18-2003	GLM 85030 Mallory 9-76102 Mercruiser Stern Drive 26-32080 26-36054 26-68493 26-823894 26-823894B	1	Oil Seal		N/A
18-2049	GLM 85020 Mallory 9-76111 Mercruiser Stern Drive 26-32511	1	Oil Seal		N/A
18-2056	Chrysler/Force/US Marine 26-66302 GLM 85060 Mallory 9-76130 Mercruiser Stern Drive 26-37259 26-89237 26-96503 26-965031 Mercury Marine 26-56394 26-66302	1	Oil Seal		N/A
18-2944	GLM 85140 Mallory 9-76512 Mercruiser Stern Drive 26-45577 26-455771 26-45577B 26-45577B1	1	Seal Ring Gasket		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	2	Drain Screw Gasket		N/A
18-3110	GLM 12830 Mallory 9-43604 Mercruiser Stern Drive 26-38970 Mercury Marine 26-29677 26-36557A1 26-38970	1	Water Pump Housing Bushing		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	2	O-Ring		N/A
18-7161	GLM 80420 Mallory 9-76546 Mercruiser Stern Drive 25-32546 Mercury Marine 25-32546	1	O-Ring		N/A
18-7169	Chrysler/Force/US Marine 25-F24278 GLM 82380 Mallory 9-76551 Mercruiser Stern Drive 25-35984 25-70937 OMC Stern Drive 911686	1	O-Ring		N/A
18-7445	GLM 80190 Mallory 9-76568 Mercruiser Stern Drive 25-55801	1	O-Ring		N/A
18-0521	GLM 85150 Mercruiser Stern Drive 26-36557 Mercury Marine 26-36557	1	Water Tube Rubber Seal		N/A

Additional Details:

• For: 4-Stroke O/B's 25/30/40/45/50 Hp SN: 0G760300 & Up

Interchanges/Replaces

Chrysler/Force/US Marine

• 26-821309

Mercury Marine

• 26-821309

Key Features:

• Converts 8 cyl GM Engines to electronic

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-5443	Crusader 7243200 GLM 72113 Indmar 556132 Mallory 9-29708 Mercruiser Stern Drive 817378 817378T 898253T27 OMC Stern Drive 3854002 986644 Volvo Penta 3854002	1	Ignition Coil		N/A
18-5515		1	Delco EST Distributor Coil to Module Harness		N/A
18-5516		1	DELCO EST DISTRIBUTOR TIMING TOOL		N/A
18-5517		1	DELCO EST SHIFT INTERRUPT HARNESS		N/A
18-5484-1	Mallory 9-26700 YLE624AV Mercruiser Stern Drive 805222A1 OMC Stern Drive 3850399 3857400 Volvo Penta 3857400 3857449	1	Delco HEI Distributor (GM V8)		N/A
18-8832-1	CDI 631-0006 Mallory 9-28011 Mercruiser Stern Drive 84-816608A68 84-816608Q68	1	Spark Plug Wire Set		N/A
18-26812	Indmar 801010 Mallory 9-26812	1	HEI Coil Connector GRAY		N/A

Additional Details:

• Fits: MCM 3.7L engines (1976-1989)

Interchanges/Replaces

GLM

• 31820

Mallory

• 9-61313

Mercruiser Stern Drive

• 27-73666

Key Features:

• For: GM 305/350 CID (5.0L & 5.7L)

Interchanges/Replaces

Chris-Craft

• 16.11-01236

Crusader

• 91351

GLM

• 30353

Mallory

• 9-61300

Mercruiser Stern Drive

• 27-11999
• 27-34043
• 27-52202
• FI1101236
• FI5000161

OMC Stern Drive

• 912965

Key Features:

• For: GM 305/350, 5.0 & 5.7L

Interchanges/Replaces

GLM

• 30357

Mallory

• 9-61305

Mercruiser Stern Drive

• 27-17467
• FI1101287

OMC Stern Drive

• 3852687
• 913270

Volvo Penta

• 3852687
• 856072

Key Features:

• For: GM 153 & 181 CID (2.5L & 3.0L)

Interchanges/Replaces

GLM

• 32210

Mallory

• 9-61317

Mercruiser Stern Drive

• 27-34041
• 27-52145
• 27-806452
• 27-851040

OMC Stern Drive

• 3852693
• 912981
• 913277

Volvo Penta

• 3852693

Interchanges/Replaces

Volvo Penta

• 1378909
• 463999

Additional Details:

• For: 330 (s/n 4623115 & later), 340 (IB) (s/n 5889914 & later), 454 Mag (s/n A631894 & later)

Interchanges/Replaces

Mallory

• 9-61652

Mercruiser Stern Drive

• 26-49131
• 26-67863
• 26-75982
• 26-75988
• F3866612
• FI1100968
• FI1101117

Interchanges/Replaces

Volvo Penta

• 1306630
• 419702
• 833347