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MerCruiser R MR Alpha I Upper Driveshaft (Drive Shaft) housing See reference picture below! Fits all 1983-1990. |
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| Reference Number
see chart below |
Type | OE# | Part# |  |
| 1 | U-joint assembly | 64819 | ||
| 2 | Long yoke | 59830A 7 | 64830 | |
| 3 | U-joint, 2 required, MC1 | 75832T | 64832 | |
| 3 | Heavy duty U-joint, MC1 | 75832T 1 | 64832 | |
| 4 | Short yoke, MC1 | 46020T | 84020 | |
| 5 | Retainer nut | 816811 2 | 64811 | |
| 6 | U-joint ring | 35983 | 64983 | |
| 7 | Yoke seal | 26-823894 | 64894 | |
| 8 | Back to back bearing kit | 31-35988A12 | 18-1160 | |
| 9 | Shim kit upper gear | 15-35980A1 | 18-2292 | |
| 10 | Upper gear set 1.98:1 | 43-55778A 3 | 64778 | |
| 10 | Upper gear set 1.84:1 | 43-75325A 3 | 64325 | |
| 10 | Upper gear set 1.47:1 | 43-184114 2 | 64411 | |
| Not shown | Yoke nut and washet | 11-22339 & 12-45810 | 61820 | |
| 11 | Pinion nut | 11-22339 | 18-3713 | |
| 12 | Upper gear Bearing, 1.98:1 & 1.84:1 ratio | 31-335990A 1 | 18-1161 | |
| 12 | Upper gear Bearing, 1.47:1 | 31-32573A 1 | 18-1142 | |
| 13 | Shim kit upper pinion | 15-36178A 1 | 18-2293 | |
| 14 | Upper drive shaft | 45-55796 | 64796 | |
| 15 | Top cap Bearing | 31-61100A 1 | 18-1165 | |
| 16 | Shim kit top cap | 15-45691A 1 | 18-2282 | |
| 17 | Water housing kit | 42724A 3 | 64724 | |
| 18 | Seal kit | 26-32511A 1 | 64511 | |
| Not shown | Drain / fill screw gasket, 10 pack | 27-19183 3 | 64183 | |
| Not shown | Carrier and yoke seal assembly | 66081A 2 | 62717 | |
