Mercruiser New Lower Unit/Gearcase, Gen II HA

New MerCruiser Alpha One Gen II Lower Unit – HA Model (1991–2023)

Upgrade your MerCruiser Alpha One Gen II sterndrive system with this brand-new HA model lower unit, designed to fit models with 2.0 or 2.4 gear ratios. Built from high-grade aftermarket parts (non-OEM), this MerCruiser lower unit offers durability, smooth performance, and precise fitment for engines ranging from 1991 to 2023.

This replacement is ideal for MerCruiser 4.3 lower unit needs and is compatible with SE116 sterndrive applications. The gearcase includes provisions for the latest speedometer fitting (OE# 860382), which is not included, and must be installed separately to retain speedometer functionality.

Whether you’re restoring your Alpha 1 Gen 2 lower unit or replacing a damaged one, this model ensures optimal performance across various water conditions. Its robust black finish complements a wide range of MerCruiser configurations, making it a top choice for both private owners and marine service shops.

Pricing

Total Price: $1,065
Less $200 Core rebate
Final Price: $865

Product Finish:

• High-quality aftermarket build
• Marine-grade black finish
• Compatible with Alpha One Gen 2 gear housing

Core Rebate Information

• Return your old core, get up to $200 back
• Rebate amount will vary based on the condition of your core
• ♻️ Recycle your core- keep boat parts out of the landfill

Useful Resources

• 🔍 How to find your Boat Engine serial number? 
• Still deciding? Watch our YouTube video How to avoid common lower unit replacement mistakes
• To help extend the life of your gearcase, check out our Boat Maintenance Checklist