9011A27 9011J10 Mercury 25" Extra Long Shaft Gearbox | Genuine Used Part

🔧 Product Description

Genuine Mercury 100HP-125HP Four-Cylinder 25-Inch Gearcase - Part Numbers: 9011A27 / 9011J10

A genuine used black Mercury / Mariner extra-long lower unit for 100HP, 115HP and 125HP inline-four two-stroke outboards. The 25-inch assembly belongs to the 2.07:1 three-jaw reverse family and Mercury 9011J10 consolidates several earlier X-long service numbers.

⚙️ Key Features

• Genuine Mercury / Mariner complete lower unit
• Current family reference 1667-9011J10
• Earlier reference 9011A27
• 25-inch extra-long shaft
• Used on 100HP to 125HP inline-four two-strokes

🚤 Compatibility

Commonly used on

• Mercury and Mariner 100HP inline-four two-strokes
• Mercury and Mariner 115HP inline-four two-strokes
• Mercury and Mariner 125HP inline-four two-strokes

Typically suits

• 25-inch extra-long transom installations
• Approximately 1987-and-later carburetted inline-four engines
• Three-jaw reverse-clutch systems using the 9011J10 chart
• Verify the serial, ratio and shift cam because 2.31:1 charts also exist
• HP Range: 100HP - 125HP
• Shaft Length: 25 inches / XL
• Gear Ratio: Normally 2.07:1 for the J10 application
• Reverse Clutch: Three-jaw
• Fitment Requirement: Confirm original assembly number and tooth count

🔌 Function

The lower unit transfers power through the extra-long driveshaft and reduction gears to the propeller while providing directional shifting and cooling-water supply.

⚠️ Common Signs of Failure

• Incorrect ratio or clutch style
• Gear engagement delay
• Propeller-shaft bearing play
• Water-contaminated oil
• Corrosion, impact damage or cracked skeg

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 9011J10 replaces 9011G40
• 9011J10 also cross-references 9011A27, 9011A64 and 9011A82
• 9011J13 is a related later or service-production reference

OEM / Related Numbers

• 1667-9011J10
• 9011J10
• 9011A27
• 9011A64
• 9011A82
• 9011G40
• 9011J13
• 2.07:1 / 14-tooth-pinion gearcase family

Aftermarket / Verified Equivalents

• Pro Marine new-service 25-inch gearcase cross-referenced to 9011J10
• Professionally remanufactured Mercury 100HP-125HP XL gearcases
• Aftermarket gear, clutch, bearing and seal kits
• Used genuine 9011A27 / A64 / A82 / G40 / J10 units
• Mercury new old stock assemblies where available

📦 Condition

• Genuine used part
• Removed from running engine or vessel where applicable
• In good working condition unless otherwise stated