Product Description
Mercruiser Sterndrive Alpha One Gear Chart Ratios
Horsepower |
Engine |
Year |
Ratio |
120 thru 140 |
4 cyl. One drive |
1971 thru 79 |
1.94 / 20-24 |
170 thru 190 |
4 cyl. One drive |
1971 thru 79 |
1.81 / 17-19 |
165 |
6 cylinder |
1971 thru 79 |
1.62 / 24-24 |
188 thru 260 |
V-8 |
1971 thru 79 |
1.47 / 20-22 |
120 thru 140 |
4 cyl. One drive |
1980 thru 84 |
1.94 / 20-24 |
170 thru 190 |
4 cyl. One drive |
1980 thru 84 |
1.81 / 17-19 |
165 |
6 cylinder |
1980 thru 84 |
1.62 / 24-24 |
188 thru 260 |
V-8 |
1980 thru 84 |
1.47 / 20-22 |
120 & 140 |
4 cylinder |
1985 thru 89 |
1.94 / 20-24 |
120 & 140 |
4 cylinder |
1985 thru 89 |
1.94 / 20-24 |
170 thru 190 |
4 cylinder |
1985 thru 89 |
1.81 / 17-19 |
170 thru 190 |
4 cylinder |
1985 thru 89 |
1.81 / 17-19 |
198 |
V-8 |
1985 thru 89 |
1.62 / 24-24 |
198 |
V-8 |
1985 thru 89 |
1.62 / 24-24 |
198 thru 260 |
V-8 |
1985 thru 89 |
1.47 / 20-22 |
198 thru 260 |
V-8 |
1985 thru 89 |
1.47 / 20-22 |
Alpha One Gen II
Horsepower
|
Engine
|
Year
|
Ratio
|
120 & 140 | 4 cylinder | 1991 thru present | 1.93 / 20-24 |
175 & 4.3 | V-6 | 1991 thru present | 1.81 / 17-19 |
198 | V-8 | 1991 thru present | 1.62 / 24-24 |
198 thru 260
|
|
1991 thru present | 1.47 / 20-22
|
1986
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
120
|
2.50 L
|
Alpha One
|
1.94
|
140
|
3.0 L
|
Alpha One
|
1.94
|
170
|
3.7 L
|
Alpha One
|
1.81
|
185
|
4.3 L
|
Alpha One
|
1.81
|
190
|
3.7 L
|
Alpha One
|
1.81
|
200
|
5.0 L
|
Alpha One
|
1.62
|
205
|
4.3 L
|
Alpha One
|
1.81
|
230
|
5.0 L
|
Alpha One
|
1.47
|
260
|
5.7 L
|
Alpha One
|
1.47
|
350 Magnum
|
5.7 L
|
Alpha One
|
1.47
|
454 Magnum
|
7.4 L
|
Alpha One
|
1.47
|
1987
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
2.5L/120
|
2.50 L
|
Alpha One
|
1.94
|
3.0L/140
|
3.0 L
|
Alpha One
|
1.94
|
165
|
3.7 L
|
Alpha One
|
1.81
|
175
|
4.3 L
|
Alpha One
|
1.81
|
180
|
3.7 L
|
Alpha One
|
1.81
|
200
|
5.0 L
|
Alpha One
|
1.62
|
205
|
4.3 L
|
Alpha One
|
1.81
|
230
|
5.0 L
|
Alpha One
|
1.47
|
260
|
5.7 L
|
Alpha One
|
1.47
|
350 Magnum
|
5.7 L
|
Alpha One
|
1.47
|
454 Magnum
|
7.4 L
|
Alpha One
|
1.47
|
1988-1989
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
2.5L/120
|
2.50 L
|
Alpha One
|
1.94
|
3.0L/140
|
3.0 L
|
Alpha One
|
1.94
|
3.7L/165
|
3.7 L
|
Alpha One
|
1.81
|
4.3L/175
|
4.3 L
|
Alpha One
|
1.81
|
3.7LX/180
|
3.7 L
|
Alpha One
|
1.81
|
5.0L/200
|
5.0 L
|
Alpha One
|
1.62
|
4.3LX/205
|
4.3 L
|
Alpha One
|
1.81
|
5.0LX/230
|
5.0 L
|
Alpha One
|
1.47
|
5.7/260
|
5.7 L
|
Alpha One
|
1.47
|
350 Magnum/270
|
5.7 L
|
Alpha One
|
1.47
|
454 Magnum/365
|
7.4 L
|
Alpha One
|
1.47
|
1990
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
3.0L/115
|
3.0 LL
|
Alpha One
|
1.94
|
3.0LX/135
|
3.0 L
|
Alpha One
|
1.94
|
4.3L/155
|
4.3 L
|
Alpha One
|
1.81
|
4.3LX/175
|
4.3 L
|
Alpha One
|
1.81
|
5.0L/180
|
5.0 L
|
Alpha One
|
1.62
|
5.0LX/205
|
5.0 L
|
Alpha One
|
1.47
|
5.7LX/230
|
5.7 L
|
Alpha One
|
1.47
|
350 Magnum/240
|
5.7 L
|
Alpha One
|
1.47
|
1991
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
3.0L/115
|
3.0 LL
|
Alpha One Gen II
|
1.94
|
3.0LX/135
|
3.0 L
|
Alpha One Gen II
|
1.94
|
4.3L/155
|
4.3 L
|
Alpha One Gen II
|
1.81
|
4.3LX/175
|
4.3 L
|
Alpha One Gen II
|
1.81
|
5.0L/180
|
5.0 L
|
Alpha One Gen II
|
1.62
|
5.0LX/205
|
5.0 L
|
Alpha One Gen II
|
1.47
|
5.7LX/230
|
5.7 L
|
Alpha One Gen II
|
1.47
|
350 Magnum/240
|
5.7 L
|
Alpha One Gen II
|
1.47
|
1992
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
3.0L/115
|
3.0 LL
|
Alpha One Gen II
|
1.94
|
3.0LX/135
|
3.0 L
|
Alpha One Gen II
|
1.94
|
4.3L/155
|
4.3 L
|
Alpha One Gen II
|
1.81
|
4.3LX/175
|
4.3 L
|
Alpha One Gen II
|
1.81
|
5.0L/180
|
5.0 L
|
Alpha One Gen II
|
1.62
|
5.0LX/205
|
5.0 L
|
Alpha One Gen II
|
1.47
|
5.7LX/230
|
5.7 L
|
Alpha One Gen II
|
1.47
|
350 Magnum/240
|
5.7 L
|
Alpha One Gen II
|
1.47
|
1993
Model/hp
|
Displacement
|
Drive Unit
|
Gear Ratio
|
3.0L/115
|
3.0 LL
|
Alpha One Gen II
|