Item is subject to a 20% restocking fee (Boat Covers, Bimini Tops, Outdrives, Drop Ship Items and Special Order Parts)!
**Year, Serial Number, and Horsepower are required to order. Please contact us with this information after you place your order otherwise processing will be delayed.
Refer to Sterndrive Engineering's model chart below to find your proper Mercruiser Sterndrive Replacement. These are typical applications; it is best to confirm your ratio by couting the teeth in the upper. Although great care was taken in the creation of this guide, its accuracy cannot be guaranteed.
| Model | Year Range | Serial Range | Notes (See Below) | Standard Rotation | Counter Rotation |
| 120,140 | 1967-1969 | 2062141-2791956 | 1,2,3,4,5,6 | 1.94 | 1.94 CR |
| 120,140 | 1970-1982 | 2791957-6225576 | 2,4,5,6 | 1.94 | 1.94 CR |
| 160 | 1967-1969 | 2065190-2763441 | 1,2,3,4,5,6 | 1.62 | 1.62 CR |
| 165 | 1970-1977 | 2763442 and up | 2,4,5,6 | 1.62 | 1.62 CR |
| 225-S | 1974 | 3856268-4200499 | 4,5,6 | 1.47 | 1.47 CR |
| 233 | 1975-1977 | 4200500 | 4,5,6 | 1.47 | 1.47 CR |
| 250 | 1977 | 4791300-4898729 | 4,5,6 | 1.47 | 1.47 CR |
| 260 | 1978-1982 | 4898730-6225576 | 4,5,6 | 1.47 | 1.47 CR |
| 470 | 1976-1982 | 4208730-6225576 | 2,4,5,6 | 1.81 | 1.81 CR |
| 485 | 1980-1982 | 4893835 and up | 2,4,5,6 | 1.81 | 1.81 CR |
| 888 | 1971-1977 | 3106717 and up | 4,5,6 | 1.47 | 1.47 CR |
| 898/228 | 1977-1982 | 4782330-622576 | 4,5,6 | 1.47 | 1.47 CR |
| R/MR/Alpha One | 1983-1990 | 6225577-OD469585 | 6,7 |
Notes:
| Engine Configuration | Horsepower | Gear Ratio | Tooth Count | Standard Rotation | Counter Rotation |
| Inline 4 Cyl. 2.5L/3.0L | 120,140 | 1.98/1.94 | 20/24 | 1.94 | 1.94 CR |
| Inline 4 Cyl. 3.7L | 170 | 1.84/1.81 | 17/19 | 1.81 | 1.81 CR |
| Inline 6 Cyl. | 160/165 | 1.65/1.62 | 24/24 | 1.62 | 1.62 CR |
| V6 4.3L | 185/190 | 1.84/1.81 | 17/19 | 1.81 | 1.81 CR |
| V8 305 2 Barrel Carb. | 200 | 1.65/1.62 | 24/24 | 1.62 | 1.62 CR |
| V8 305/350 | 230/260 | 1.50/1.47 | 20/22 | 1.47 | 1.47 CR |
Click Here to Download Installation and Removal Guide for SternDrive 90-106-01D
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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