{"product_id":"ultimate-dana-big-bell-40-spline-cv-axle-for-ford-f-250-350","title":"RCV Dana Big Bell 40-Spline CV Axle Set for Ford F-250\/350","description":"\u003cp\u003eThe RCV Ultimate Dana Big Bell 40 Spline CV Axle Set is the strongest front axle solution available for 2005+ Ford F-250 and F-350 Super Duty Dana 60 applications running a 40-spline aftermarket differential. This system replaces weak OEM U-joint axle shafts with RCV’s Big Bell constant velocity (CV) architecture, derived directly from RCV’s 2.5-ton Rockwell CV platform.\u003c\/p\u003e\n\u003cp\u003eUnlike traditional Dana 60 upgrades, the Big Bell CV outer stub is engineered to interface directly with the large 32-spline Ford Super Duty unit bearing, eliminating lockouts or drive flanges entirely. Fewer components mean greater strength, improved reliability, and smoother power delivery under extreme load.\u003c\/p\u003e\n\u003cp\u003eRCV Big Bell CVs maintain full strength at extreme steering angles, eliminate U-joint binding, and dramatically reduce drivetrain shock. This makes them ideal for heavy trail rigs, competition crawlers, and high horsepower diesel builds. Like all RCV Ultimate axles, this system is low maintenance and backed by a No Questions Asked Limited Lifetime Warranty.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncluded in this kit:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Left Big Bell CV axle\u003c\/li\u003e\n\u003cli\u003e(1) Right Big Bell CV axle\u003c\/li\u003e\n\u003cli\u003eSST Spherical Sealing Technology seals\u003c\/li\u003e\n\u003cli\u003eInstallation tool\u003c\/li\u003e\n\u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003cli\u003eSynthetic moly grease\u003c\/li\u003e\n\u003cli\u003eInstallation hardware\u003c\/li\u003e\n\u003cli\u003eBlack oxide coating (standard)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eOptional nickel plating available for high-corrosion environments.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT INSTALLATION NOTICE\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eKnuckle Modification Required This axle set requires modification to OEM 2005+ Ford Super Duty knuckles to clear the Big Bell CV. Installation guide PDF available.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRequired:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBall Joint Eliminator Kit\u003c\/li\u003e\n\u003cli\u003eMinor internal knuckle clearancing \/ machining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cul\u003e\n\u003cli\u003eAxle Model: Dana 60\u003c\/li\u003e\n\u003cli\u003eVehicle Type: Ford Super Duty\u003c\/li\u003e\n\u003cli\u003eHub Type: Unit Bearing\u003c\/li\u003e\n\u003cli\u003eOEM Inner Spline: 35\u003c\/li\u003e\n\u003cli\u003eOEM Outer Spline: 35\u003c\/li\u003e\n\u003cli\u003eRCV Inner Spline: 40\u003c\/li\u003e\n\u003cli\u003eRCV Outer Spline: Large 32 (Ford Super Duty unit bearing)\u003c\/li\u003e\n\u003cli\u003eLong Inner Axle Length: 39.01\u003c\/li\u003e\n\u003cli\u003eShort Inner Axle Length: 16.78\u003c\/li\u003e\n\u003cli\u003eOuter Stub Length: 7.03\u003c\/li\u003e\n\u003cli\u003eBoot \/ Seal Technology: SST Spherical Sealing Technology\u003c\/li\u003e\n\u003cli\u003eCoating: Black oxide (standard)\u003c\/li\u003e\n\u003cli\u003eWarranty: Limited Lifetime (No Questions Asked)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cul\u003e\n\u003cli\u003e2005+ Ford F-250 Super Duty\u003c\/li\u003e\n\u003cli\u003e2005+ Ford F-350 Super Duty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eRequirements\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cul\u003e\n\u003cli\u003eRequires aftermarket 40-spline differential\u003c\/li\u003e\n\u003cli\u003eDoes NOT fit OEM 35-spline carriers\u003c\/li\u003e\n\u003cli\u003eDesigned for OEM Super Duty unit bearings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eTech Insight\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cp\u003eThe Big Bell CV system removes the inherent weakness of U-joints by maintaining constant rotational velocity through the joint, eliminating binding, reducing shock loads, and preserving steering control under extreme torque. By pairing Rockwell derived CV strength with Ford’s large unit bearing interface, this setup delivers massive strength with fewer failure points.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e","brand":"RCV Performance","offers":[{"title":"Default Title","offer_id":56095465406630,"sku":"CVJ60-FORD4-40","price":4195.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/CVJ60-FORD4-40-Dana-Big-Bell-40-Spline-CV-Axle-Ford-F-250_350-1.jpg?v=1778082419","url":"https:\/\/wideopendesign.com\/products\/ultimate-dana-big-bell-40-spline-cv-axle-for-ford-f-250-350","provider":"Wide Open Design","version":"1.0","type":"link"}