Mercury - Shift Cable 22 Foot Sterndrive Shift Control Cable - 858342A22. The Mercury Shift Cable is designed for Mercury sterndrive applications where longer helm-to-drive routing is required. It provides smooth, controlled gear engagement on boats where standard-length cables may feel strained or require forced routing. The 22-foot length supports extended installations on larger boats and is commonly used as a service replacement when shifting becomes stiff, binding increases, or gear engagem