Upper Sterndrive Unit Complete. Replaces: Mercruiser® Alpha One Gen II series. Available in your choice of 1.47, 1.62, 1.81, 1.94, 2.0, & 2.4 gear ratios. $695.00 Call toll free to order 888-567-8448 Upper Sterndrive Unit Complete. Replaces: 1973-1991 Mercruiser® R/MR/Alpha One series. Available in your choice of 1.47, 1.62, 1.81 & 1.94 gear ratios. $595.00 Call toll free to order 888-567-8448 PRODUCT BREAKDOWN Upper Gears U Joints Bearings U-joints for all four operating gear ratios: 1.47 (20/22) // 1.62 (24/24) 1.81 (17/19) // 1.94 (20/24)