{"product_id":"ford-9-40-spline-lightweight-steel-spool-3-250-bearing-copy","title":"Ford 9\" 40 spline steel spool (3.250\" Bearing)","description":"\u003cp class=\"p1\"\u003eMark Williams steel spools are precision machined from US Made 4140 steel forgings on CNC machinery for ultimate precision and accuracy. The ring gear register and bearing diameters are precision ground with the spool mounted on a special arbor to assure concentricity between the splines and the ground surfaces and final ground to ensures zero runout on the ring mounting surface. Engineered for maximum reliability, MW spools have an increased cross-section under the ring gear register to prevent ring gear deflection. MW spools are heat treated in-house with the same austemper through hardening heat treat process as our strongest in class MW “Hi-Torque” axles for ultimate strength. \u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eThe Mark Williams Advantage\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eThrough hardened alloy steel, not egg-shell-thin hardened case\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eRing gear mounting diameter is ground to precise press fit\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eAll mounting diameters concentric and square within .001\"\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eIncreased cross section and generous radius under mounting prevents deforming\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eMade in the USA! Forged, Ground, Machined, and Heat Treated in the USA!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eMark Williams 40 spline steel spool for use with 9\" Ford Rear End. Requires 3.250\" bore case including the \u003ca href=\"https:\/\/mwdriveline.myshopify.com\/products\/9-5-ford-aluminum-thru-bolt-case-3-812-bearing-w-steel-caps\"\u003e57440\u003c\/a\u003e\u003ca href=\"https:\/\/www.markwilliams.com\/57440.html\"\u003e\u003c\/a\u003e Mark Williams aluminum and \u003ca href=\"https:\/\/mwdriveline.myshopify.com\/products\/9-ford-aluminum-thru-bolt-case-3-250-bearing-w-aluminum-caps\" title='Nodular Steel Third Member 3.250\"'\u003e57470\u003c\/a\u003e\u003ca href=\"https:\/\/www.markwilliams.com\/57470.html\"\u003e\u003c\/a\u003e Mark Williams nodular cases, and also requires \u003cspan\u003e45mm wheel bearing (p\/n \u003c\/span\u003e\u003ca href=\"https:\/\/mwdriveline.myshopify.com\/products\/large-big-ford-olds-axle-bearing-3-150-od\"\u003e58505\u003c\/a\u003e\u003ca href=\"https:\/\/www.markwilliams.com\/58505.html\"\u003e\u003c\/a\u003e\u003cspan\u003e)\u003c\/span\u003e. Profile milling and cross-hole drilling saves 2-1\/2 pounds over standard unit. Manufactured from through hardened 4140 high strength steel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstructions: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0943\/6666\/3021\/files\/sb0046.pdf?v=1756843707\" target=\"_blank\" title=\"Spool Instructions\" rel=\"noopener\"\u003eSB0046\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFeatures:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCut for 40 spline axles \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e4140 Through hardened steel\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUses 7\/16 bolts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWeighs 11 pounds\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMade in the USA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: We recommend replacing ring gear bolts every time a new gear is setup.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0943\/6666\/3021\/files\/53136.jpg?v=1761236612\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Mark Williams","offers":[{"title":"No","offer_id":43658120233038,"sku":"53136","price":370.0,"currency_code":"USD","in_stock":true},{"title":"Yes Add 57900 (+49.99)","offer_id":43658120265806,"sku":"53136-1","price":419.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/7593\/4798\/files\/MRW_3470.jpg?v=1776832863","url":"https:\/\/killintimeracing.net\/products\/ford-9-40-spline-lightweight-steel-spool-3-250-bearing-copy","provider":"Killin Time Racing","version":"1.0","type":"link"}