Volvo Penta Lower Gear Unit. 1.61:1 Gear ratio. Most common for 8 cylinder engine applications. Longer vertical shaft common for SP-A 290A but fits all the way through the AQ series (270 275 280 285 290) or later models with a 2 inch coupler instead of 3 inch that I can supply with the purchase . New prop shaft seals pressure tested after installation. Prop shaft is straight. Bearings are great. Fresh water and very clean original paint.