{"product_id":"mercury-mercruiser-aeu-bravo-three-gear-housing-seacore-1-81-ratio-fits-bravo-iii-xr-aeu-1-81-ratio-1656-8866j07","title":"Mercury – Complete Gearcase | SeaCore Bravo Three XR Series | Hard-Coat Anodized Alloy | 8866J07","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Complete Gearcase | SeaCore Bravo Three XR Series | Hard-Coat Anodized Alloy | 8866J07\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e There’s a certain calm that settles in when your boat responds exactly the way you expect — that smooth lift onto plane, the quiet push as the props bite, the confidence that your sterndrive is doing its job without complaint. When you spend your weekends chasing horizon lines or weaving through tight channels, you come to rely on the parts beneath the surface more than anything else. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury Marine part number 8866J07 Complete Gearcase\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis built\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for boaters who depend on that reliability. It brings back the steady, trustworthy feel you expect from a Bravo Three XR SeaCore system, especially when saltwater and long days start to test everything on board.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eComplete gearcase for MerCruiser SeaCore Bravo Three XR sterndrives with 1.81 gear ratio\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eSeaCore hard-coat anodized housing \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ebuilt\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for maximum corrosion resistance\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eTri-Paint protective system adds a multilayer barrier against harsh marine conditions\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eXK360 low-copper alloy helps combat long-term corrosion in saltwater environments\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eHeavy-duty forged gears and reinforced U-joint \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eengineered\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for strength and longevity\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits MerCruiser SeaCore Bravo Three XR sterndrives\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for systems using the 1.81 gear ratio\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for performance cruisers, offshore pleasure boats, sport boats, and premium twin-engine setups\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSuitable for boaters who regularly navigate saltwater, brackish inlets, or high-demand coastal conditions\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e What you feel when you run a boat powered by a Bravo Three XR system is a blend of smooth control and solid thrust — and that starts inside the gearcase. The 8866J07 delivers a steady, balanced transfer of power, letting your counter-rotating props grip cleanly and push the hull with confidence. Shifts feel crisp. Handling stays tight. And even when you’re maneuvering in a crowded marina or easing into a narrow cove, the response is predictable and smooth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSaltwater is unforgiving, and that’s where the SeaCore protection earns its keep. The hard-coat anodizing, the Tri-Paint system, and the specialized low-copper alloy all work together to keep corrosion at bay. Instead of worrying about pitting or hidden wear, you get to focus on the ride. Heavy-duty forged gears bring a level of durability you can feel — especially under load, during sharp turns, or when you open the throttle in choppy water. Installation is clean and straightforward, and once it’s in place, the gearcase settles into its job with a quiet, dependable steadiness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e A gearcase isn’t a part you want to guess on. When you choose a \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003egenuine Mercury Marine part\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, you’re \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003echoosing\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e components designed specifically for your sterndrive’s architecture. Everything lines up the way it should — the mating surfaces, the internal gear geometry, the protective coatings — all engineered to work as a system. Aftermarket assemblies may be cheaper upfront, but they rarely match the fit, balance, or long-term durability Mercury builds into every SeaCore component. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIf you want performance without compromise and a drive that lasts season \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eafter\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e season, OEM is \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003esimply\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the practical choice.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which systems does the Complete Gearcase 8866J07 fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits MerCruiser SeaCore Bravo Three XR sterndrives equipped with the 1.81 gear ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this better than aftermarket gearcases?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e The engineering and the corrosion protection. Mercury’s hard-coat anodizing, Tri-Paint finish, and forged gears deliver durability \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eaftermarket\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e versions can’t match.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know if this is the correct replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Check that your drive is a Bravo Three XR SeaCore model and confirm your gear ratio is 1.81. If both match, this part number is typically the correct fit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e. It’s built specifically for harsh saltwater conditions, so freshwater operation is easily within its range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFor experienced boat owners or marine technicians, installation follows standard Bravo Three XR replacement procedures \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ewith\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e reliable \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003efitmen\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003et\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46941251502371,"sku":"1656-8866J07","price":6372.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8866J07_Main.jpg?v=1760631269","url":"https:\/\/partsvu.com\/en-mx\/products\/mercury-mercruiser-aeu-bravo-three-gear-housing-seacore-1-81-ratio-fits-bravo-iii-xr-aeu-1-81-ratio-1656-8866j07","provider":"PartsVu","version":"1.0","type":"link"}