{"product_id":"raparts-c670fi-overrunning-pto-coupler-1-1-8-in-x-1-3-8-in-tractor","title":"RAParts C670FI Overrunning PTO Coupler (1 1\/8 in x 1 3\/8 in) - Tractor","description":"\u003cp\u003eIn this review the RAParts C670FI overrunning power take off coupler is assessed for owners of older Ford\/New Holland tractors who need a reliable PTO connection. The bottom line: this replacement coupler is best for mechanics and hobby farmers who want to upgrade a 1 1\/8 in PTO shaft to the more common 1 3\/8 in standard while retaining 540 rpm operation. The reviewer found the part to be straightforward to fit on tractors with a pre-drilled attachment hole and appreciated that it includes the required 8mm x 50mm roll pin, making installation cleaner and faster.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect replacement:\u003c\/strong\u003e Designed as a one new replacement overrunning PTO coupler that fits Ford Tractor models 2N, 8N, 9N, NAA and Jubilee, so owners can restore PTO function without major modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft size upgrade:\u003c\/strong\u003e Increases shaft diameter from 1 1\/8 in to the 1 3\/8 in standard, which helps connect modern implements that require the larger male spline.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual spline ends:\u003c\/strong\u003e Internal diameter\/female 1.125 in with 6 spline and external diameter\/male 1.375 in with 6 spline, providing a secure mating with compatible PTO shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e540 rpm ready:\u003c\/strong\u003e Intended for use with 540 rpm PTO shafts, making it suitable for most common tractor PTO-driven implements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes roll pin:\u003c\/strong\u003e Supplied with the required 8mm x 50mm roll pin for attachment, reducing the need to source small hardware separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength and extension:\u003c\/strong\u003e Overall coupler length is 6 3\/4 in and it increases shaft length by about 4 in, useful where reach is limited.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe C670FI coupler is aimed at owners and technicians working on vintage Ford\/New Holland tractors (2N, 8N, 9N, NAA, Jubilee) who need a durable, aftermarket replacement PTO coupler and want to upgrade to a 1 3\/8 in standard shaft size. It suits those who use 540 rpm implements and have a tractor with the hole pre-drilled for attachment.\u003c\/p\u003e\n\u003cp\u003eIt is not intended for tractors lacking the pre-drilled mounting hole or for unusual PTO speeds other than 540 rpm. Buyers who require factory OEM branding or specialized friction clutch behavior should consider OEM or model-specific alternatives.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStraightforward compatibility with several classic Ford tractor models makes replacement fast and predictable.\u003c\/li\u003e\n\u003cli\u003eUpgrades shaft diameter from 1 1\/8 in to 1 3\/8 in, allowing connection to modern implements.\u003c\/li\u003e\n\u003cli\u003eIncludes the 8mm x 50mm roll pin, which simplifies installation and reduces small-part sourcing.\u003c\/li\u003e\n\u003cli\u003eRobust overall length and added shaft reach help clear driveline geometry limitations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAftermarket part may differ slightly from OEM finish or fit, so minor adjustments during installation can be necessary.\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for 540 rpm PTO shafts, so it is not suited to tractors with other PTO speed arrangements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart number replacements\u003c\/td\u003e\n\u003ctd\u003e48A27, C670FI, C670F, 271148\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits tractor models\u003c\/td\u003e\n\u003ctd\u003eFord 2N, 8N, 9N, NAA, Jubilee\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFemale I.D.\u003c\/td\u003e\n\u003ctd\u003e1.125 in with 6 spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale O.D.\u003c\/td\u003e\n\u003ctd\u003e1.375 in with 6 spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall length\u003c\/td\u003e\n\u003ctd\u003e6 3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft length increase\u003c\/td\u003e\n\u003ctd\u003eApproximately 4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncludes\u003c\/td\u003e\n\u003ctd\u003e8mm x 50mm roll pin for attachment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe RAParts C670FI coupler is a practical, cost-effective aftermarket replacement for older Ford\/New Holland tractors that need a 1 1\/8 in to 1 3\/8 in upgrade for 540 rpm PTO use. Its included roll pin and clear fitment to classic models make it a good value for DIY mechanics and small-scale farmers, provided the tractor has the pre-drilled attachment hole.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my 8N tractor?\u003c\/strong\u003e\u003cbr\u003eYes, the coupler is listed to fit Ford 8N tractors and similar models when the tractor has a pre-drilled hole for attachment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the roll pin included?\u003c\/strong\u003e\u003cbr\u003eYes, the part ships with the required 8mm x 50mm roll pin for securing the coupler.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this be used on non-540 rpm PTOs?\u003c\/strong\u003e\u003cbr\u003eNo, this coupler is intended for use with 540 rpm PTO shafts and is not specified for other PTO speeds.\u003c\/p\u003e","brand":"Aftermarket","offers":[{"title":"Default Title","offer_id":48248014340315,"sku":"B08BG9RNZT","price":48.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41sitiwrMdL._SL1000.jpg?v=1770969269","url":"https:\/\/gearmusthave.com\/products\/raparts-c670fi-overrunning-pto-coupler-1-1-8-in-x-1-3-8-in-tractor","provider":"GearMustHave","version":"1.0","type":"link"}