Bonbo Lower Shift Cable Kit for MerCruiser Alpha One & Gen II (1978+) — Complete Assembly with Stainless Hardware

Bonbo 865436A02 is a complete lower shift cable assembly designed to replace worn or damaged MerCruiser Alpha One and Gen II lower shift cables for reliable gear engagement on 1978 and newer drives.

This OEM-style replacement kit restores shift control on MerCruiser outdrives by supplying the full lower cable assembly and all required small parts. It replaces MerCruiser part numbers 19543A10, 19543A8 and 865436A02, and is compatible with many equivalent aftermarket listings from GLM, Sierra and Mallory. The kit is packaged with the slide, guides, anchors, set screws, insert, stainless wire and the primary shift cable so you can swap the worn assembly without sourcing separate components.

Which MerCruiser models and years will this lower shift cable fit?

This kit covers a wide range of MerCruiser outdrives. It fits MC-I MR Alpha (1978 and newer), Alpha One Gen I (1983–1990) and Alpha One Gen II (1991–2016). Verify compatibility with your drive housing and service manual before ordering.

• MC-I MR Alpha series: 1978 and later
• Alpha One Gen I: model years 1983–1990
• Alpha One Gen II: model years 1991–2016
• Direct replacement for MerCruiser OEM part numbers listed

What parts are included and how does installation work?

The kit arrives with the lower shift cable plus the small hardware pieces needed for a straightforward swap. Installation generally involves removing the existing lower cable from the outdrive, transferring or replacing the guide and anchor hardware, and fastening the new cable with the supplied set screws and insert.

• Included: slide, guide, anchor, set screws and stainless wire
• Primary 21710 41951A1 lower shift cable included
• No extra components typically required for standard installations
• Follow service manual torque and adjustment specifications for final setup

How does this replace OEM and aftermarket part numbers?

Bonbo engineered this assembly as a direct replacement for common MerCruiser and aftermarket references. It matches the fit and function of several OEM numbers and known aftermarket equivalents so it can be used as a drop-in substitute in most repair scenarios.

• Replaces MerCruiser 865436A02, 19543A10 and 19543A8
• Compatible substitute for GLM 21451, Sierra 18-2603, Mallory 9-72100
• Includes matching slide and guide hardware for correct alignment
• Designed for direct installation without custom modification

What should I expect for durability and post-install performance?

The assembly is built to restore reliable shifting and resist typical marine wear when installed and adjusted properly. While environmental conditions and maintenance affect service life, replacing a damaged lower cable eliminates slack and improves gear selection control.

• Marine-grade components and stainless wire to resist corrosion
• Factory-compatible geometry for consistent shift travel
• Regular inspection and lubrication extend service life
• 30-day satisfaction return policy for purchase confidence

Who is this for: Technicians, DIY boat owners and marine service shops replacing lower shift cables on MerCruiser Alpha One and Gen II outdrives will find this Bonbo kit a practical, parts-complete solution. If your boat shows loose, inconsistent shifting or if the existing cable is frayed, corroded or broken, this assembly provides the hardware needed to restore proper gear engagement without hunting down individual components.