Description
New Aftermarket MerCruiser Gen 2 Upper Gearcase – For MerCruiser Sterndrives (1991–Present)
This New Mercruiser Gen II Upper Unit is a premium aftermarket replacement designed to fit MerCruiser sterndrive models from 1991 to Present. Specifically built for Gen 2 I/O drives, this upper gear housing is available in four different gear ratios and is engineered to deliver long-lasting performance under demanding marine conditions.
Whether you’re replacing a damaged upper unit or upgrading for improved performance, this gearcase fits seamlessly into your system. It’s the perfect choice for those working on MerCruiser gearcase repairs, MerCruiser stern drive maintenance, or full gearcase rebuilds using high-quality, affordable non-OEM parts.
Compatible Gear Ratios & OEM Reference Numbers:
- 1.94 / 2.16 Ratio – OEM# 861063A6
- 1.81 Ratio – OEM# 861063A8
- 1.62 / 2.0 Ratio – OEM# 861063A10
- 1.47 Ratio – OEM# 861063A12
Each unit is precision-machined to meet or exceed OEM standards and comes backed by our 3-Year FAULT-FREE Warranty — a testament to our commitment to quality and durability.
Pricing
- 💲 For full pricing and availability, please call 913-342-0011
- 💲 Units sold with or without core exchange – contact us to verify final pricing.
Product Finish:
- Heavy-duty aluminum construction
- Precision internal gear fit
- Non-OEM aftermarket replacement
- Compatible with MerCruiser Gen 2 I/O systems up to present-day models
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
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