861063a10 1.62:1 and 2.00:1 mercruiser driveshaft housing alpha 1 gen 2 | Genuine Used Part

🔧 Product Description

Genuine MerCruiser Alpha One Gen II Complete Upper Driveshaft Housing - Part Number: 861063A10

A genuine MerCruiser Alpha One Gen II upper drive assembly used with both 1.62:1 and 2.00:1 complete sterdrive configurations.

The assembly contains the upper gear set, vertical driveshaft, universal-joint assembly and shift-shaft components. The final complete-drive ratio depends on the matched lower unit and gear configuration.

⚙️ Key Features

• Genuine MerCruiser Alpha One Gen II upper unit
• Correct part number 861063A10
• Suitable for 1.62 and 2.00 complete-drive ratios
• Includes the upper gear and universal-joint housing
• Fits standard Alpha One Gen II transom assemblies

🚤 Compatibility

Commonly used on

• MerCruiser Alpha One Gen II sterndrives

Typically suits

• Engine and drive models:
• MerCruiser 4.3L V6 with 1.62:1 Alpha Gen II drive
• MerCruiser 4.3LX V6 with 1.62:1 Alpha Gen II drive
• MerCruiser 3.0L four-cylinder with 2.00:1 Alpha Gen II drive
• MerCruiser 3.0LX with 2.00:1 Alpha Gen II drive
• Alpha One Gen II serial 0D469859 and above
• HP Range: Approximately 120HP - 300HP, dependent on complete-drive configuration
• Drive Type: Alpha One Gen II upper driveshaft housing
• Complete-Drive Ratios: 1.62:1 and 2.00:1
• Year Range: 1991 onward

🔌 Function

The upper unit transfers power from the engine coupler through the universal joint and upper bevel gears to the vertical driveshaft. It also carries the upper shift and lubrication passages connecting the drive's upper and lower sections.

⚠️ Common Signs of Failure

• Whining, rumbling or knocking from the upper gears
• Universal joints have play, rust or stiffness
• Gear oil leaks from the input or driveshaft seals
• Water contamination from damaged bellows or seals
• Upper gears, bearings or splines show excessive wear

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 861063A10 current complete upper driveshaft-housing reference
• 1547-861063A10 formatted assembly reference

OEM / Related Numbers

• 861063A10
• 1547-861063A10
• 815930A5 related earlier upper-housing reference
• 5121300TP related complete 1.62 sterndrive
• 5121600TP related complete 2.00 sterndrive
• Alpha One Gen II standard-rotation lower gear housing

Aftermarket / Verified Equivalents

• SEI Marine: 90-116-01C upper driveshaft housing
• SEI Marine: SE116 Alpha One Gen II upper unit
• Specialist remanufactured 861063A10 upper assembly

📦 Condition

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