865440H51 Mercruiser Bravo Driveshaft Housing | Genuine Used Part

🔧 Product Description

Genuine MerCruiser Bravo Complete Upper Driveshaft Housing - Part Number: 865440H51

A genuine MerCruiser complete Bravo upper drive assembly fitted with a 27-tooth drive gear and 32-tooth driven gear.

This upper housing is shared across specific Bravo One, Bravo Two and Bravo Three ratios from serial number 0W250000 onward.

⚙️ Key Features

• Genuine MerCruiser complete Bravo upper unit
• Correct part number 865440H51
• 27/32 upper gear combination
• Cone-clutch Bravo driveshaft housing
• Fits specified Bravo One, Two and Three ratios

🚤 Compatibility

Commonly used on

• MerCruiser Bravo One, Bravo Two and Bravo Three sterndrives

Typically suits

• Drive models:
• Bravo One 1.50:1
• Bravo Two 1.65:1
• Bravo Two 2.00:1
• Bravo Three 1.50:1
• Bravo Three 1.65:1
• Bravo Three 2.00:1
• Drive serial 0W250000 and above
• HP Range: Approximately 200HP - 425HP, dependent on complete-drive model
• Engine Type: MerCruiser petrol or diesel sterndrive engine
• Gear Set: 27-tooth drive gear / 32-tooth driven gear
• Year Range: Approximately 2006 onward

🔌 Function

The upper housing receives power from the engine through the universal-joint shaft. Its cone clutch selects forward or reverse, while the 27/32 gear set transfers power to the vertical driveshaft and matched lower unit.

⚠️ Common Signs of Failure

• Cone clutch slips or engages harshly
• Upper gears or bearings whine under load
• Universal joints vibrate or knock while steering
• Gear oil leaks from the input or vertical-shaft seals
• Water enters through damaged bellows or sealing surfaces

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 865440H51 current 27/32 complete upper-housing reference
• 1589-865440H51 formatted Mercury assembly reference

OEM / Related Numbers

• 865440H51
• 1589-865440H51
• 865440H02 related 27/32 housing reference
• 863836A51 related earlier 27/32 upper assembly
• 865440H67 related Bravo X 27/32 upper housing
• 865440H50 related 27/29 ratio upper housing
• 865440H52 related 30/23 ratio upper housing

Aftermarket / Verified Equivalents

• Recmar: REC1589-865440H51
• Specialist remanufactured Bravo 27/32 upper unit
• No universal substitution for H50, H52 or H67 gear configurations

📦 Condition

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