{"product_id":"mercury-propshaft-840377t","title":"Mercury Propshaft #840377T","description":"\u003ch2\u003eMercury Marine 840377T Prop Shafts\u003c\/h2\u003e\n\u003cp\u003eA bent or worn propshaft doesn't just kill performance — it puts stress on your gearcase, bearings, and seals every time you run the engine. If you're chasing a vibration that won't go away or dealing with a shaft that took a hit, the Mercury Marine Propshaft #840377T is the OEM replacement built to bring your outboard back to factory spec.\u003c\/p\u003e\n\u003cp\u003eThis is a genuine Mercury Marine part, not an aftermarket substitute. When you're talking about a component that spins at thousands of RPM and transfers all of your engine's torque to the propeller, fit and metallurgy matter. OEM shafts are machined to the exact tolerances Mercury engineers designed the gearcase around — which means proper prop seating, correct spline engagement, and no surprises once you're back on the water.\u003c\/p\u003e\n\u003cp\u003eAt just under 7 lbs, the 840377T is a substantial shaft suited for larger Mercury outboard applications. If you're unsure whether this is the correct shaft for your engine, cross-reference your serial number with Mercury's parts catalog or give us a call at 816-841-3364 — we're happy to help confirm fitment before you order.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine OEM Mercury Marine propshaft — not aftermarket\u003c\/li\u003e\n\u003cli\u003eMachined to factory tolerances for proper gearcase fit\u003c\/li\u003e\n\u003cli\u003eCorrect spline engagement for secure propeller seating\u003c\/li\u003e\n\u003cli\u003eResolves vibration caused by bent or damaged shafts\u003c\/li\u003e\n\u003cli\u003eWeight: ~6.8 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eNormalized SKU:\u003c\/b\u003e 840377T\u003cbr\u003e\u003cb\u003eUPC Code:\u003c\/b\u003e 745061396562\u003c\/p\u003e","brand":"Mercury Marine","offers":[{"title":"Default Title","offer_id":53399431053617,"sku":"MRC-840377T","price":1185.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0015\/7184\/8291\/files\/mercury-propshaft-840377t-745061396562-1230832114.jpg?v=1775046007","url":"https:\/\/www.firstchoicemarine.com\/products\/mercury-propshaft-840377t","provider":"First Choice Marine","version":"1.0","type":"link"}