Mercury – Upper Driveshaft Housing | Bravo One XR Integrated Transom | Corrosion-Resistant Marine Alloy | 863836A73

Overview

There’s a certain kind of confidence that settles in when your boat responds exactly the way you expect it to. When the power comes on smooth, the drive feels planted, and the whole rig feels like it’s working with you—not against you. That peace of mind starts with the parts you choose, especially the ones buried deep in the heart of the sterndrive. This Mercury Marine part delivers that steady, reliable feel that keeps you relaxed whether you’re cruising out to the sandbar or running wide open in open water.

Key Features

• Complete upper driveshaft housing for Bravo One XR sterndrives with integrated transom
• Built from XK360 low-copper marine alloy for exceptional corrosion resistance
• Tri-Paint anti-corrosion coating for added durability in harsh marine environments
• Heavy-duty forged gears and U-joint designed for high-load performance
• Precision-machined to Mercury Marine factory specifications
• Engineered to deliver smooth, consistent torque transfer

Engine & Boat Compatibility

• Designed for MerCruiser Bravo One XR sterndrives with integrated transom
• Fits serial numbers 0W239999 and below
• Common on performance V-hulls, offshore sport boats, tournament tow boats, and heavy recreational stern-drive setups
• Ideal for vessels that see higher torque loads, frequent acceleration, or long-distance cruising

Performance & Practical Benefits

A solid upper driveshaft housing sets the tone for the entire sterndrive’s performance. When this part is right, everything feels cleaner and more precise. You’ll feel a steadier push when accelerating onto plane, more controlled turns at speed, and a smoother transition through shifting and throttle changes.

Mercury’s XK360 marine alloy isn’t just a spec on paper—it’s the reason this housing stands up season after season. Saltwater, wake impacts, heat cycles, and long weekends under load all take a toll on lesser materials. But the combination of the alloy and Tri-Paint system creates a protective barrier that helps preserve the internal structure and prevent long-term wear.

Inside the housing, the forged gears and U-joint deliver the kind of tight, steady power transfer that performance-oriented boaters notice immediately. The boat responds predictably, even when pushed hard, and the sterndrive feels solid underfoot. Whether you’re running offshore or carving long arcs on an inland lake, this Mercury Marine part keeps the drive delivering strong, reliable power.

Why Buy OEM

On high-performance units like the Bravo One XR, OEM components aren’t a luxury—they’re a necessity.

• OEM fit ensures proper alignment and reduced internal stress
• Built with marine-specific alloys and coatings aftermarket parts can’t match
• Longer life and fewer service issues over time
• Engineered for your exact drive system, not a generic substitute
• Installation is cleaner because everything lines up the way Mercury intended

If a buddy at the dock asked, you’d tell them the same thing: for critical internal parts, OEM is the only way to protect the rest of your drive.

FAQ

Q1: Which engines or systems does the Upper Driveshaft Housing 863836A73 fit?

It fits MerCruiser Bravo One XR sterndrives with integrated transom, serial No. 0W239999 and below.

Q2: What makes this better than aftermarket versions?

The alloy grade, corrosion coating, precision machining, and forged internal components all exceed aftermarket standards.

Q3: How can I confirm this is the right part?

Match your sterndrive’s serial number and confirm you have the integrated transom Bravo One XR model.

Q4: Can it be used in saltwater and freshwater?

Yes—its corrosion-resistant alloy and Tri-Paint finish are made for both.

Q5: Is installation straightforward?

If you or your technician have experience with sterndrives, installation is predictable and clean thanks to OEM fitment.