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Sierra International Complete Upper Gear Housing w/ 21-18 Ratio For OMC 2.5L/3.0L/5.0L 18-4805. 5L (1986-1989) 3.0L (1986-1993) and 5.0L (1989-1993) I/O engines. The gear housing features a 21:18 ratio. It is interchangeable with OMC Stern Drive 983885...