This listing is for a New OBR Mercruiser Alpha I Lower Drive Shaft Assembly, which will fit 4/6/8 Cylinder models from 1969 to 1990. (Please note that Alpha I serial numbers are from OD494569 and before). New lower drives are assembled with a combination of all new OEM and new aftermarket parts using only high grade American steel for gears and shafts. When placing an order, please specify gear ratio, number of cylinders, model, and serial number. Please note that older "R" style 4 & 6 cylinder units require that you reuse your input shaft. Please use chart below to help identify your model:
| ENGINE | HP |
DISPLACEMENT LITRE/CID |
CYLINDERS | GEAR RATIO | TOOTH COUNT |
| 2.5 Litre | 120 | 2.5 / 153 | 4-In-Line | 1.98 | 20-24 |
| 3 Litre | 130 | 3.0 / 181 | 4-In-Line | 1.98 | 20-24 |
| 165 | 165 | 3.7 / 224 | 4-In-Line | 1.84 | 17-19 |
| 175 | 175 | 4.3 / 262 | V-6 | 1.84 | 17-19 |
| 180, 470, 190 | 180 | 3.7 / 224 | 4-In-Line | 1.84 | 17-19 |
| 200 | 200 | 5.0 / 305 | V-8 | 1.65 | 24-24 |
| 205 | 205 | 4.3 / 262 | V-6 | 1.84 | 17-19 |
| 230 | 230 | 5.0 / 305 | V-8 | 1.50 | 20-22 |
| 260 | 260 | 5.7 / 350 | V-8 | 1.50 | 20-22 |
| 350 Magnum | 270 | 5.7 / 350 | V-8 | 1.50 | 20-22 |
A Limited One-Year Warranty is included in the order. An additional Twelve-Month Extended Warranty is available. See options and pricing above. Please read the terms of OBR's New and Remanufactured Parts Warranty at https://obparts.com/obr-red-rhino-new-and-remanufactured-parts-warranty/.
Shipping will be through Ground for a flat fee of $49.00. Increased fees will apply for Alaska, Hawaii, US Territories, and International Shipping. Shipments to Kentucky will be charged 6% KY sales tax.
If you have any questions, please contact us through e-mail at customerservice@marinepartswarehouse.com. To ensure that the proper product is ordered, please include your sterndrive's model and serial number in any message.
