Mercruiser Outdrive Parts Drawings *How to Videos

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Mercruiser upper gear set application chart

Cross reference chart for gear ratio, model year and serial numbers for Mercruiser outdrive upper gears

Model

Gear ratio

Year

Serial number

Upper drive gear kit

Upper gear housing service kit

120 / 140
1.98

1970-1982

2791957-6225576
11240
N / A
470 / 485
1.84

1976-1982

4208730-6225575
11230
N / A
165
1.65

1970-1981

2763442 and up
11220
N / A
888
1.50

1971-1977

3106717 and up
11210/11212
N / A
225-S
1.50

1974

3856268-4200499
11210/11212
N / A
898/228
1.50

1977-1982

4782330-6225576
11210/11212
N / A
260
1.50

1978-1982

4898730-6225576
11210/11212
N / A
R/MR/Alpha One
1.98

1983-1990

6225577 and up
11240
11245
R/MR/Alpha One
1.84

1983-1990

6225577 and up
11230
11235
R/MR/Alpha One
1.65

1983-1990

6225577 and up
11220
11225
R/MR/Alpha One
1.50 HD

1983-1990

6225577 and up
11210/11212
11215
Alpha One SS
1.50

1986-1989

OA545004 and Up
11210/11212

 

Alpha One Gen ll
2.40

1991-1997

 OD469859-OK999999

11240
11246
Alpha One Gen ll
1.98/1.94

1991-1997

 OD469859-OK999999

11240
11246
Alpha One Gen ll
1.65/1.62

1991-1997

 OD469859-OK999999

11220
11226
Alpha One Gen ll
1.84/1.81

1991-1997

 OD469859-OK999999

11230
11236
Alpha One Gen ll
1.50/1.47

1991-1997

 OD469859-OK999999

11210/11212
11216
Alpha One Gen ll
2.40/1.94

1998 & up

OL000040 and up

11244
11247
Alpha One Gen ll
1.81
1998 and up

 OL000040 and up

11233
11237
Alpha One Gen ll
2.00/1.62

1998 and up

OL000040 and up

11222
11227
Alpha One Gen ll
1.47

1998 and up

OL000040 and up

11214
11217

Customers also purchased:

21950 Bellows kit 30-803097T1

21950 Bellows kit 30-803097T1

P/N 21950 Transom bellows kit (1973-1990), serial numbers 3469428 - 0D469800. 30-803097T1 $145.95

Includes:
P/N 21906 Gimbal bearing
P/N 39622 bell housing gasket
P/N 47110/47120 water hoses
P/N 89050 drive shaft bellow
P/N 89080 shift cable bellow
P/N 89100 exhaust bellow
P/N 85910 oil seal

21450 Shift cable 865436A03

21450 Shift cable 865436A03

P/N 21450 Shift cable kit. Newer style cable with larger core wire. Compatible with 1967 - present Mercruiser and Alpha 1 models. OEM 865436A03 $89.95

Installs from the AFT end of the bell housing. Models from the mid 1960's - 1982 used cables which threaded in from behind the bell housing. You can make an easy modification to the bell housing yourself by using a 1/4-18 tap from inside of the bell housing.

87510 gasket kit

87510 gasket kit

P/N 87510 Lower unit seal kit for 1967-1990 (s/n 2062141 - 0D469800) $38.95
 
Includes:
P/N 12830 Seal 25-39970
P/N 21330 Slinger 25-30271
P/N 81160 O-ring 25-30613
P/N 21010 bushing assembly 23-30617A2
P/N 85070 Oil seal 26-89238
P/N 81390 O-ring 25-90011
P/N 81180 O-ring 25-25439
P/N 31020 Gasket 25-858524
P/N 31050 Gasket 27-42631-1
P/N 31010 Gasket 27-85608-1
P/N 85040 Oil seal 26-16977
P/N 85700 Oil seal 26-12224
P/N 85581 Oil seal 26-816464
P/N 85140 Seal 26-45577-1

89100 Exhaust 18654A1

89100 Exhaust 18654A1

P/N 89100 Exhaust bellow - includes clamps and grounding clips. Replaces 18654A1 or Sierra 18-2750 $22.95