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:
Alpha I Standard Production Models
| 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/.
