Parts for MerCruiser R / MR / Alpha One (Transom Assembly) 1983-1990 Gear Housing (Driveshaft) - (Counter Rotation)

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Each product listed is an OEM or aftermarket equivalent part. [ Example ]

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Engine section

Reference numbers in this diagram can be found in a light blue row below — scroll down to order.
Each product listed is an OEM or aftermarket equivalent part. [ Example ]

#	26-33144A 2	SEAL KIT (- required per assembly)
		26-33144A 2 - Seal Kit [ More info ] $95.83 In Stock
		18-2652 - Seal Kit, 26-33144A2 [ More info ] $78.37 8 In Stock.
#	43-803093T 1	GEAR KIT, Lower (1 required per assembly)
		43-803093T 1 - Gears Repair Kit [ More info ] Unavailable
#	26-32511A 1	SEAL KIT (1 required per assembly)
		26-32511A 1 - Seal Kit [ More info ] $74.33 In Stock
		18-2648 - Seal Kit, 26-32511A1 [ More info ] $53.66 In Stock
#	1623-8951A33	GEAR HOUSING ASSEMBLY (1 required per assembly)
		1623-8951A33 - Gear Housing Assembly [ More info ] Unavailable
		90-108-02 - SE108 Lower Unit Mercruiser Alpha One, Counter Rotation [ More info ] $1175.00 $1175.00 Available to Order
#	46-96148A 8	BODY ASSEMBLY, Water Pump (- required per assembly)
		46-96148A 8 - Water Pump Kit, No Base [ More info ] $65.83 10+ In Stock.
		18-3517 - Water Pump Kit, No Base, 46-96148A8 [ More info ] $54.29 $49.80 10+ In Stock.
		18-3319 - Water Pump Kit 46-42579A4, With Base 18-3419 [ More info ] $67.69 $57.40 In Stock
		18-3317 - Mercury Water Pump Kit, With Base 18-3417 [ More info ] $68.99 $65.89 5 In Stock.
		18-3316 - Water Pump Kit 46-78400A2, With Base 18-3416 [ More info ] $70.59 $62.05 In Stock
		46-96148T 8 - Water Pump Kit, No Base [ More info ] $66.33 10+ In Stock.
#	47-89984T 5	IMPELLER KIT, Water Pump (1 required per assembly)
		47-89984T 5 - Water Pump Repair Kit [ More info ] $61.80 3 In Stock.
		47-89984Q 5 - Water Pump Repair Kit [ More info ] $61.80 Available to Order: Usually ships within 10 days.
#	31-803092T 1	BEARING AND SEAL KIT (1 required per assembly)
		31-803092T 1 - Bearing Repair Kit, NLA [ More info ] Unavailable
#1	1623-8951A39	GEAR HOUSING ASSEMBLY (1 required per assembly)
		1623-8951A39 - Gear Housing Assembly [ More info ] Unavailable
#2	17-37972 1	PIN, SHIFT CRANK - GEAR HOUSING (1 required per assembly)
		17-37972 1 - Pin [ More info ] $3.50 Available to Order: Usually ships within 10 days.
#3	16-46911	STUD, GEAR HOUSING TO DRIVE SHAFT HOUSING (3-3/16 inch) (1 required per assembly)
		16-46911 - Stud [ More info ] $7.20 $1.44 10+ In Stock.
#4	16-56298	STUD, GEAR HOUSING TO DRIVE SHAFT HOUSING (1-31/32 inch) (2 required per assembly)
		16-56298 - Stud [ More info ] $4.50 1 In Stock.
#5	16-56297 2	STUD, (.312-18/.324-24 x 3.380), WATER PUMP GEAR HOUSING (1 required per assembly)
		16-56297 2 - Stud [ More info ] Unavailable
		16-8M0034463 - Stud [ More info ] $17.17 Available to Order: Usually ships within 10 days.
#6	16-69501	STUD, WATER PUMP GEAR HOUSING (3-1/4 inch) (2 required per assembly)
		16-69501 - Stud [ More info ] $3.50 10 In Stock.
#7	26-45577 1	SEAL, GEAR HOUSING (1 required per assembly)
		26-45577 1 - Seal - Priced Individually [ More info ] $4.10 10+ In Stock.
		18-2944-9 - Gasket 26-45577 2-Pack [ More info ] $5.99 $5.50 9 In Stock.
#8	17-35973	PIN, Dowel, GEAR HOUSING (2 required per assembly)
		17-35973 - Pin -Dowel - Priced Individually [ More info ] $1.70 10+ In Stock.
#9	31-42647A 1	BEARING ASSEMBLY, Roller, DRIVE SHAFT (1 required per assembly)
		31-42647A 1 - Roller Bearing - Drive Shaft [ More info ] $65.03 3 In Stock.
		18-1117 - Bearing, 387817, 31-42647A1 [ More info ] $53.99 $47.70 In Stock
#10	93423 1	INSERT, WATER PICKUP (STARBOARD) (1 required per assembly)
		93423 1 - Insert [ More info ] $8.40 4 In Stock.
#11	93424 1	INSERT, WATER PICKUP (PORT) (1 required per assembly)
		93424 1 - Insert [ More info ] $8.70 6 In Stock.
		18-3198 - Pickup, 93424-1, Port [ More info ] $3.46 Available to Order: Usually ships within 10 days.
#12	10-76156	SCREW, (#10-32 x 1.88), INSERT TO GEAR HOUSING (1 required per assembly)
		10-76156 - Screw [ More info ] $3.30 10+ In Stock.
#13	11-45812	NUT, (#10-32) Stainless Steel, INSERT SCREW (1 required per assembly)
		11-45812 - Nut, (#10-32) [ More info ] $4.43 9 In Stock.
		11-859124 - Nut, (#10-32) Stainless Steel, Nylon Insert [ More info ] $17.92 10+ In Stock.
#14	17-42836	PIN, Groove, WATER PUMP (1 required per assembly)
		17-42836 - Pin, Groove, Water Pump,NLA [ More info ] $1.80 10+ In Stock.
#15	45-42634	DRIVESHAFT ASSEMBLY (1 required per assembly)
		45-42634 - Drive Shaft [ More info ] Unavailable
		458M0140438 - Drive Shaft [ More info ] $649.50 Available to Order: Usually ships within 10 days.
		92-116-04 - Drive Shaft replaces 45-42634 [ More info ] $309.24 $309.24 Available to Order
#16	15-42637A 1	SHIM SET, DRIVE SHAFT BEARING (AR required per assembly)
		15-42637A 1 - Shim Set [ More info ] $17.77 10+ In Stock.
#17	31-36387A 1	BEARING, Roller, DRIVESHAFT (1 required per assembly)
		31-36387A 1 - Tapered Roller Bearing [ More info ] $44.99 1 In Stock.
		18-1143 - Bearing 31-36387A1 [ More info ] $49.99 $45.72 2 In Stock.
#18	824519 1	RETAINER, DRIVE SHAFT BEARING (1 required per assembly)
		824519 1 - Retainer [ More info ] $6.70 Available to Order: Usually ships within 10 days.
		18-2346 - Retainer, 824519 1 [ More info ] $4.99 $4.22 Available to Order: Usually ships within 10 days.
#19	43-828071A 1	GEAR SET (INCLUDES PINION AND FORWARD GEARS) (1 required per assembly)
		43-828071A 1 - Gear Set [ More info ] $299.99 9 In Stock.
#20	12-92721	WASHER, PINION GEAR (1 required per assembly)
		12-92721 - Washer, Pinion Gear [ More info ] $1.40 $0.78 10+ In Stock.
		18-2359 - Nut Kit [ More info ] $5.19 $2.97 Available to Order: Usually ships within 10 days.
		18-2343-9 - Washer, 12-92721, 2PK [ More info ] $2.79 Available to Order: Usually ships within 10 days.
#21	11-35921	NUT, (.625-18), PINION GEAR TO DRIVESHAFT (1 required per assembly)
		11-35921 - Nut, (.625-18) [ More info ] $7.70 10+ In Stock.
		18-3719 - Nut, 11-35921, 314730 [ More info ] $4.99 $4.51 4 In Stock.
#22	22-67892A 1	FITTING KIT, Magnetic, Plug Fill/Drain (1 required per assembly)
		22-67892A 1 - Drain Plug [ More info ] Unavailable
		22-67892A05 - Drain Plug Kit [ More info ] Unavailable
		22-67892A06 - Drain Plug Kit [ More info ] Unavailable
		22-8M0058389 - Screw Kit - Priced Individually [ More info ] $10.30 10+ In Stock.
		18-23751-9 - Drain Screw , Package of 50 [ More info ] $338.69 $294.70 In Stock
		18-2375 - Plug, 22-67892A1 [ More info ] $6.99 $6.04 10+ In Stock.
#23	12-19183 2	WASHER, FILL/DRAIN SCREW (1 required per assembly) (Component of Lower Seal Kit 26-33144A2)
		12-19183 2 - Washer - Priced Individually [ More info ] Unavailable
		12-19183 3 - Seal -Blue - Priced Individually [ More info ] $1.40 10+ In Stock.
		18-2945-9 - Gasket 12-19183 2-Pack [ More info ] $2.29 4 In Stock.
		12-19183Q02 - Seals, Pack of 4 (yes this is actually a pack of 4) [ More info ] $6.40 10+ In Stock.
		12-19183K02 - Seal, Pack of 4 [ More info ] $6.40 10+ In Stock.
#24	46-44292A 3	BASE ASSEMBLY, Water Pump (1 required per assembly)
		46-44292A 3 - Water Pump Base [ More info ] $45.14 1 In Stock.
		18-3420 - Water Pump Base 46-44292A3 [ More info ] $35.99 $32.60 10 In Stock.
#25	27-42631 1	GASKET, WATER PUMP TO GEAR HSG (1 required per assembly) (Component of Water Pump Kit 46-44292A3)
		27-42631 1 - Gasket [ More info ] $3.90 10+ In Stock.
		18-2919-9 - Gasket 27-42631 2-Pack [ More info ] $5.19 2 In Stock.
#26	25-90011	O-RING, (2.175 x .175), WATER PUMP (1 required per assembly) (Component of Water Pump Kit 46-44292A3)
		25-90011 - Drive Shaft Cover O-Ring [ More info ] $1.39 10+ In Stock.
		25-896523 - O-ring, (2.175 X .103) [ More info ] Unavailable
		25-8M0142854 - O-Ring [ More info ] $1.10 Available to Order: Usually ships within 10 days.
#27	26-16977	SEAL, Oil, WATER PUMP (1 required per assembly)
		26-16977 - Seal [ More info ] $21.01 In Stock
		18-2026 - Seal, 321453 [ More info ] $15.99 $15.95 10+ In Stock.
		18-2013 - Seal, 26-16977 [ More info ] $15.99 $14.42 8 In Stock.
#29	27-85608 1	GASKET, LOWER - WATER PUMP (1 required per assembly) (Component of Water Pump Impeller Kit 47-89984T5)
		27-85608 1 - Gasket - Priced Individually [ More info ] Unavailable
		27-8M0090319 - Water Pump Gasket - Priced Individually [ More info ] $4.00 10+ In Stock.
		18-2914-9 - Gasket 27-85608 2-Pack [ More info ] $5.99 2 In Stock.
#30	27-858524	GASKET, UPPER - WATER PUMP (1 required per assembly) (Component of Water Pump Impeller Kit 47-89984T5)
		27-858524 - Water Pump Base Gasket [ More info ] $3.90 10+ In Stock.
		18-2915-9 - Gasket 27-858524 2-Pack [ More info ] $5.19 10+ In Stock.
#31	32435	FACE PLATE (1 required per assembly)
		32435 - Face Plate - Priced Individually [ More info ] Unavailable
		32435 1 - Face Plate [ More info ] $8.90 2 In Stock.
		8M0204677 - Wear Plate [ More info ] $8.90 10 In Stock.
#32	46-96148T 1	BODY ASSEMBLY, Water Pump (1 required per assembly)
		46-96148T 1 - Water Pump Body [ More info ] $49.92 In Stock
		18-3116 - Housing 46-96148A1 [ More info ] $48.99 $44.58 3 In Stock.
#33	48752T	INSERT, WATER PUMP (1 required per assembly)
		48752T - Water Pump Insert - Priced Individually [ More info ] $11.90 Available to Order: Usually ships within 10 days.
		18-3114 - SS Cup, 48752 [ More info ] $3.19 $2.63 Available to Order: Usually ships within 10 days.
#34	26-38970	SEAL, RUBBER - WATER INLET TUBE (1 required per assembly)
		26-38970 - Seal - Priced Individually [ More info ] $4.90 10+ In Stock.
		18-3110 - Seal, 26-38970 [ More info ] $3.49 $2.77 Available to Order: Usually ships within 10 days.
#35	47-89984T 4	IMPELLER, WATER PUMP (1 required per assembly)
		47-89984T 4 - Impeller [ More info ] $47.58 10+ In Stock.
		18-3017 - Impeller 47-89984 [ More info ] $39.99 $20.88 10+ In Stock.
#36	28-56654	KEY, IMPELLER DRIVE (1 required per assembly)
		28-56654 - Drive Key - Priced Individually [ More info ] $1.99 5 In Stock.
		28-8M0032834 - Key - Priced Individually [ More info ] $4.40 10+ In Stock.
		28-8M0214992 - KEY @5 [ More info ] Unavailable
#37	10-96411	SCREW, (#14-8 x 2.25), WATER PUMP TO GEAR HOUSING (1 required per assembly)
		10-96411 - Screw [ More info ] $1.70 10+ In Stock.
		10-8M0215009 - SCREW [ More info ] Unavailable
#38	11-13438	NUT, (.250-28), WATER PUMP STUD (2 required per assembly)
		11-13438 - Nut (1/4-28) [ More info ] Unavailable
		11-826711 9 - Nut [ More info ] $2.50 10+ In Stock.
#39	12-29245	WASHER, (.281 x .500 x .060) Stainless Steel, WATER PUMP STUD (2 required per assembly)
		12-29245 - Washer [ More info ] $0.89 10+ In Stock.
		12-8M0204649 - WASHER Note: Priced Individually [ More info ] $1.20 Available to Order: Usually ships within 10 days.
#40	11-13436	NUT, WATER PUMP STUDS (5/16-24) (1 required per assembly)
		11-13436 - Nut (5/16-24) [ More info ] $3.20 4 In Stock.
#41	12-36001	WASHER, WATER PUMP STUD (1 required per assembly)
		12-36001 - Washer - Priced Individually [ More info ] $1.40 10+ In Stock.
		18-4270 - Washer 12-36001 [ More info ] $1.25 $0.92 10+ In Stock.
#42	25-30271	RING, Rubber, DRIVE SHAFT (1 required per assembly)
		25-30271 - Ring - Priced Individually [ More info ] Unavailable
		25-8M0214918 - WATER PUMP HSG RUBBER RING O/B [ More info ] $1.90 5 In Stock.
		18-7426-9 - O-Ring (PK2) 25-30271 [ More info ] $3.99 $3.22 2 In Stock.
#43	25-30613	O-RING, UPPER - DRIVE SHAFT (1 required per assembly) (Component of Water Pump Impeller Kit 47-89984T5)
		25-30613 - O-ring, Upper Drive Shaft [ More info ] $1.70 10+ In Stock.
		25-8M0214919 - O RING @5 [ More info ] Unavailable
		18-7158-9 - (PK5) O-Ring 25-30613 [ More info ] $8.99 5 In Stock.
#44	23-29804T	SLEEVE, GUIDE - WATER INLET TUBE (1 required per assembly)
		23-29804T - Sleeve - Priced Individually [ More info ] $8.70 10+ In Stock.
		18-3109 - Tube 23-29804 [ More info ] $6.19 $5.60 3 In Stock.
#45	77481 1	SHIFT SHAFT, LOWER (1 required per assembly)
		77481 1 - Shift Shaft - Lower [ More info ] $60.75 $52.50 8 In Stock.
		18-2150 - Shaft, 77481-1 [ More info ] $59.29 $53.76 3 In Stock.
#46	53-29641	E RING, SHIFT SHAFT (1 required per assembly)
		53-29641 - E Ring - Priced Individually [ More info ] $1.70 4 In Stock.
		18-4295-9 - Clip, 53-29461, 2PK [ More info ] $2.59 $2.17 4 In Stock.
#47	12-27880	WASHER, LOWER SHIFT SHAFT AND CRANK (1 required per assembly)
		12-27880 - Washer, Lower Shift Shaft And Crank [ More info ] $1.60 10+ In Stock.
#48	25-25439	O-RING, (.862 x .103), SHIFT SHAFT BUSHING (1 required per assembly)
		25-25439 - O-Ring, Shaft Shaft Bushing [ More info ] $1.90 10+ In Stock.
		18-7420-9 - O-Ring (PK5) 25-21836 [ More info ] $9.99 $9.50 4 In Stock.
#49	23-30617A 2	BUSHING ASSEMBLY, SHIFT SHAFT (1 required per assembly)
		23-30617A 2 - Bushing Assembly [ More info ] Unavailable
		23-8M0112749 - Shift Shaft Bushing ZZ [ More info ] $28.17 In Stock
		18-2154 - Bushing, 23-30617A2 [ More info ] $23.99 $21.73 5 In Stock.
#50	26-89236 1	SEAL, Oil, SHIFT SHAFT BUSHING (1 required per assembly)
		26-89236 1 - Seal [ More info ] $17.00 10+ In Stock.
		18-2009 - Seal, 26-89236 [ More info ] $11.99 $11.31 10+ In Stock.
#51	12-31266	WASHER, RUBBER - SHIFT SHAFT BUSHING (1 required per assembly)
		12-31266 - Washer (rubber) [ More info ] $1.10 Available to Order: Usually ships within 10 days.
#52	12-29395	WASHER, (.390 x 1.00 x .06), SHIFT SHAFT (1 required per assembly)
		12-29395 - Washer, (.390 X 1.00 X .06) [ More info ] $0.98 6 In Stock.
		12-8M0042641 - Washer [ More info ] $1.60 Available to Order: Usually ships within 10 days.
		18-4267-9 - Washer, 12-29395, 2PK [ More info ] $2.99 2 In Stock.