{"product_id":"velvet-drive-5-inch-output-coupling-a4547ha-10-tooth-coarse-spline","title":"Velvet Drive 5-Inch Output Coupling A4547HA | 10-Tooth Coarse Spline","description":"\u003ch2\u003eVelvet Drive 5-Inch Output Coupling A4547HA — 10-Tooth Coarse Spline\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003eA4547HA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eVelvet Drive \/ BorgWarner\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eOfficial Product Type\u003c\/th\u003e\n\u003ctd\u003eMarine Transmission Output Coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eFlange Diameter\u003c\/th\u003e\n\u003ctd\u003e5.00 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSpline\u003c\/th\u003e\n\u003ctd\u003e10-tooth coarse spline\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBolt-Circle Diameter\u003c\/th\u003e\n\u003ctd\u003eapprox. 4.25 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSystem\u003c\/th\u003e\n\u003ctd\u003eTransmission Output — Propeller Shaft Drive\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eCross-Reference\u003c\/th\u003e\n\u003ctd\u003eBorgWarner \/ Velvet Drive 4547AY | Aftermarket ALT23323\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSupersedes\u003c\/th\u003e\n\u003ctd\u003eConfirm supersession history with current Velvet Drive documentation\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eReplaced By\u003c\/th\u003e\n\u003ctd\u003eVerify current production status at time of order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe A4547HA is a marine transmission output coupling for early-style BorgWarner \/ Velvet Drive transmissions. It mounts to the transmission output shaft via a 10-tooth coarse spline and connects to the vessel’s propeller-shaft coupling flange. The 5-inch flange diameter and 4.25-inch bolt-circle are the key dimensional identifiers for this coupling position. A correct-fitting output coupling is critical for maintaining propeller-shaft alignment and preventing driveline vibration and seal wear.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBorgWarner \/ Velvet Drive 71-series marine transmissions\u003c\/li\u003e\n  \u003cli\u003eBorgWarner \/ Velvet Drive 72-series marine transmissions\u003c\/li\u003e\n  \u003cli\u003e72-series direct-drive transmissions\u003c\/li\u003e\n  \u003cli\u003eEarly-style Velvet Drive reduction transmissions using the 5-inch coarse-spline coupling configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment note:\u003c\/strong\u003e Velvet Drive transmissions were also fitted with 4-inch coarse-spline output couplings in some configurations. Spline count alone does not confirm the correct coupling — verify the flange diameter, bolt-circle, and transmission identification tag before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFlange diameter: 5.00 in.\u003c\/li\u003e\n  \u003cli\u003eSpline: 10-tooth coarse spline\u003c\/li\u003e\n  \u003cli\u003eBolt-circle diameter: approx. 4.25 in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKit Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × A4547HA output coupling assembly\u003c\/li\u003e\n  \u003cli\u003eMounting hardware not included — reuse existing coupling hardware or source separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eService Interval\u003c\/h3\u003e\n\u003cp\u003eInspect the output coupling at every major drivetrain service or when vibration increases. Replace when inspection shows any of the following:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVisible spline wear or damage on the internal bore\u003c\/li\u003e\n  \u003cli\u003eExcessive shaft play at the coupling\u003c\/li\u003e\n  \u003cli\u003eDamaged, distorted, or cracked flange faces\u003c\/li\u003e\n  \u003cli\u003eElongated bolt holes\u003c\/li\u003e\n  \u003cli\u003eCorrosion affecting structural integrity\u003c\/li\u003e\n  \u003cli\u003eDriveline vibration traced to the coupling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eInspect the transmission output-shaft splines for wear before fitting the new coupling\u003c\/li\u003e\n  \u003cli\u003eVerify full spline engagement before torquing\u003c\/li\u003e\n  \u003cli\u003eClean both mating flange faces before assembly\u003c\/li\u003e\n  \u003cli\u003eCheck the propeller-shaft coupling face for damage or distortion\u003c\/li\u003e\n  \u003cli\u003eUse the specified coupling hardware at the correct torque\u003c\/li\u003e\n  \u003cli\u003ePerform a proper shaft-to-transmission alignment check after installation\u003c\/li\u003e\n  \u003cli\u003eAn improperly aligned coupling will cause vibration, accelerated bearing wear, shaft seal failure, and potential transmission damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCross-Reference \/ Alternate Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eA4547HA\u003c\/strong\u003e — SKU as supplied\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBorgWarner \/ Velvet Drive 4547AY\u003c\/strong\u003e — documented 5-inch, 10-tooth coarse-spline coupling (confirm physical match before substituting)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eALT23323\u003c\/strong\u003e — aftermarket reference for the 4547AY configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote on 4547BA:\u003c\/strong\u003e The 4547BA is a related but different Velvet Drive coupling associated with the 10-17 direct-drive transmission. It is not interchangeable with the 5-inch 4547AY \/ A4547HA configuration — do not substitute without confirming the transmission model and output-shaft spline.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warner-output-flange\"\u003eBorg Warner Output Flange\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warne-5\"\u003eBorgWarner Output Flange — 4-Inch Coarse Spline 10-Tooth\u003c\/a\u003e (related smaller-diameter variant)\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warne-7\"\u003eBorg-Warner Output Nut 4775L\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warne-8\"\u003eBorg Warner Shift Spool O-Ring — Velvet Drive 71C \/ 72C | 4804H\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warner-velvet-drive-oil-pump-71c-72c-71c-a60\"\u003eBorg Warner Velvet Drive Oil Pump — 71C \/ 72C Series | 71C-A60\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/collections\/couplings-drive-components\"\u003eBrowse all Couplings \u0026amp; Drive Components\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/collections\/transmission-parts\"\u003eBrowse all Transmission Parts \u0026amp; Components\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cdl\u003e\n  \u003cdt\u003eIs A4547HA the same as BorgWarner 4547AY?\u003c\/dt\u003e\n  \u003cdd\u003eThe A4547HA SKU strongly matches the documented BorgWarner \/ Velvet Drive 4547AY 5-inch, 10-tooth coarse-spline coupling based on dimensional and application data. However, A4547HA has not been confirmed in publicly indexed manufacturer catalogs under that exact number. Verify the physical part, packaging, or supplier cross-reference before treating them as identical.\u003c\/dd\u003e\n\n  \u003cdt\u003eHow do I confirm the correct output coupling for my transmission?\u003c\/dt\u003e\n  \u003cdd\u003eLocate the transmission identification tag and record the model number. Measure the existing coupling’s flange diameter and bolt-circle, and count the spline teeth on the output shaft. Confirm all three — diameter, bolt-circle, and spline count — match this coupling before ordering.\u003c\/dd\u003e\n\n  \u003cdt\u003eWhat is the difference between the 5-inch and 4-inch coarse-spline couplings?\u003c\/dt\u003e\n  \u003cdd\u003eBoth use a 10-tooth coarse spline but have different flange diameters and bolt-circles. The 5-inch version (A4547HA \/ 4547AY) is used on 71 and 72-series transmissions in certain configurations; the 4-inch version is used in others. Spline count alone does not determine which coupling your transmission requires — flange diameter is a critical identifier.\u003c\/dd\u003e\n\n  \u003cdt\u003eCan I use 4547BA instead of A4547HA?\u003c\/dt\u003e\n  \u003cdd\u003eNo. The 4547BA is associated with the 10-17 direct-drive transmission and is not the same configuration as the 5-inch A4547HA \/ 4547AY coupling. Do not substitute without confirming your transmission model and output-shaft dimensions.\u003c\/dd\u003e\n\n  \u003cdt\u003eDo I need to re-align the shaft after replacing the coupling?\u003c\/dt\u003e\n  \u003cdd\u003eYes. Propeller-shaft alignment should always be verified after any output coupling replacement. Even a small misalignment will cause vibration, accelerated seal and bearing wear, and potential transmission damage over time.\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e The A4547HA is the correct coupling for Velvet Drive 71 and 72-series installations that use the 5-inch, 10-tooth coarse-spline output configuration. It’s a high-value driveline component — at this price point, customers are typically doing a full drivetrain overhaul or replacing a damaged coupling after a hard impact or prolonged vibration damage. The related \u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warner-output-flange\"\u003eBorg Warner Output Flange\u003c\/a\u003e and \u003ca href=\"https:\/\/marisolmarine.com\/products\/borg-warne-7\"\u003eoutput nut\u003c\/a\u003e are natural add-ons for a complete service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon customer questions:\u003c\/strong\u003e The most frequent issue is customers confusing the 5-inch and 4-inch coarse-spline versions — both are 10-tooth, so spline count alone does not resolve the order. Always ask for the transmission model number and the existing coupling’s flange diameter. The second common issue is uncertainty about whether A4547HA equals 4547AY — advise customers to confirm the cross-reference from their supplier invoice or the physical part number before completing the order. Shaft alignment after installation is frequently skipped by DIY customers and should be flagged proactively.\u003c\/p\u003e","brand":"FVW","offers":[{"title":"Default Title","offer_id":43563794923556,"sku":"A4547HA","price":740.82,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/781c149a-8a9e-4357-bdce-853d6986d6a4.png?v=1788741254","url":"https:\/\/marisolmarine.com\/products\/velvet-drive-5-inch-output-coupling-a4547ha-10-tooth-coarse-spline","provider":"Marisol Marine Company","version":"1.0","type":"link"}