{"product_id":"currie-ford-9-inch-third-member-assembly-31-spline","title":"Currie Ford 9-Inch Third Member Assembly (31-Spline)","description":"\u003cp\u003eNew, built-to-order Currie 9-inch third member set up for 31-spline axles. Options include a choice of gear case material, differential type, gear ratio, and pinion yoke.\u003c\/p\u003e\u003cbr\u003e\u003ch4\u003eFeatures:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSelect from In Stock or Built to Order 3rd. Members\u003c\/li\u003e\n\u003cli\u003eChoice of Nodular Iron or Aluminum Gear Case\u003c\/li\u003e\n\u003cli\u003eChoice of Nodular Iron or Aluminum Big Bearing (Daytona) Pinion Support\u003c\/li\u003e\n\u003cli\u003eChoice of Gear Ratio, Carrier, and Pinion Yoke\u003c\/li\u003e\n\u003cli\u003eIncludes Heavy-Duty Plastic Shipping\/Storage Box\u003c\/li\u003e\n\u003cli\u003eSetup and Assembled by Skilled Professionals\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cp\u003eA complete Currie 9-inch third member makes it easy to update your street rod, muscle car, or truck with a new gear ratio or performance differential. All Currie built-to-order third members feature a new gear case, bearings, seals, solid pinion bearing spacer, and Daytona pinion support, with a choice of gear ratio, pinion yoke, and differential type.\u003c\/p\u003e\u003cp\u003eCurrie 9-inch third members are assembled by our in-house experts, who have decades of rear end setup and assembly experience, so that you can trust the finished product.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Features:\u003c\/strong\u003e\u003c\/h3\u003e\u003cstrong\u003e Iron Gear Case\u003c\/strong\u003e\u003cp\u003eThe Currie Sportsman nodular iron case boasts a rigid design that minimizes gear deflection, reinforced material around the pilot bearing, and solid billet adjuster nuts, ensuring exceptional stability and durability\u003c\/p\u003e\u003cstrong\u003eIron Pinion Support\u003c\/strong\u003e\u003cp\u003eCurrie nodular iron Daytona big-bearing pinion support increases load capacity and improves oil capacity with maximum strength and rigidity\u003c\/p\u003e\u003cstrong\u003eAluminum Pinion Support\u003c\/strong\u003e\u003cp\u003eCurrie aluminum Daytona big-bearing pinion support, all the features of our iron pinion support in lightweight aluminum with a red anodized finish\u003c\/p\u003e\u003cstrong\u003eAluminum Gear Case\u003c\/strong\u003e\u003cbr\u003e\u003cp\u003eThe HD Pro aluminum case features 9\/16 through-bolt main caps for enhanced strength, a robust forged aluminum pinion support with high-flow oil passages, and an optional load bolt designed to limit gear deflection and maintain precise gear engagement\u003c\/p\u003e\u003cstrong\u003eMaster Bearing Kit\u003c\/strong\u003ePremium Timken or Koyo bearings, high-performance seals, and a solid pinion spacer ensure long-lasting, trouble-free performance.\u003cstrong\u003eGear Ratio\u003c\/strong\u003e\u003cp\u003eSelect from a wide variety of ratios. Currie uses only the highest quality Motive Gear Performance\u003csup\u003e®\u003c\/sup\u003e series (Orange box) ring and pinion sets \u003c\/p\u003e\u003cstrong\u003eDifferential\u003c\/strong\u003e\u003cp\u003eSelect the differential type that meets your traction needs, including helical gear limited-slip, automatic locking differential, or steel spool\u003c\/p\u003e\u003cstrong\u003ePinion Yoke\u003c\/strong\u003e\u003cp\u003eSelect from a range of pinion yokes, including nodular and or billet Chromoly\u003c\/p\u003e\u003cstrong\u003eFully Assembled\u003c\/strong\u003e\u003cp\u003eFully assembled and set up in-house by skilled professionals\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDIFFERENTIAL OPTIONS EXPLAINED\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCurrie TwinTrac, Truetrac, and Wavetrac \u003c\/strong\u003e- Helical gear limited-slip type differentials (HGLSD). The HGLSD is the modern replacement for the classic clutch-style limited-slip. When cruising, HGLSDs function like a standard or open differential, allowing one wheel to spin faster or slower as needed without the noise or stick-slip that are frequently experienced with clutch-style limited-slip or automatic locking differentials. Under acceleration, if a wheel loses traction, the helical gears inside the differential automatically engage, transferring torque to both rear wheels. When the wheels regain traction, the HGLSD seamlessly transitions back to open-differential operation. Unlike traditional clutch-type limited-slip differentials, HGLSDs require no special oil additive or maintenance to replace worn clutches. HGLSDs have no wearable parts, require no special oil additive or maintenance, and maintain their as-new functionality for life.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eARB Air Locker \u003c\/strong\u003e- The ARB is a selectable locking differential that allows the driver to positively lock or unlock the differential on demand with the flick of a dash-mounted switch. An onboard air compressor (sold separately) is used to apply the locking force. Once locked, the differential behaves like a spool, driving both wheels equally. When unlocked, the locker acts like an open differential, driving only one wheel at a time – usually the wheel with the least traction. The key benefits of the ARB Air Locker are its predictable behavior and legendary strength.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDetroit Locker\u003c\/strong\u003e - Automatic locking differential, designed to automatically lock and unlock when torque is applied in either a forward or reverse direction. When locked, it acts like a spool, driving both wheels equally. When coasting or rolling into a corner (no torque applied), the Detroit Locker unlocks and momentarily operates like an open differential, permitting the wheels to rotate freely. When torque is applied at the corner exit, the unit locks and drives both wheels equally. The key benefits of the Detroit Locker are its rugged construction and superb performance. The only negative is that the automatic lock-and-unlock operation can create a clunking sensation that is both felt and heard in the vehicle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpool - \u003c\/strong\u003eThe spool is the most straightforward and robust option, but it lacks differential action because both axles are joined by the spool's solid center. Spools are not recommended for the street, as they impose high torsional loads on the axles, increase tire wear, and adversely affect handling. They are typically used only for drag-racing applications, where straight-line performance is the sole concern.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNOTES:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLubrication Requirements\u003c\/strong\u003e - 9-inch rearends use a high-offset hypoid gear design that requires a severe-duty 85w-140 non-synthetic gear oil with an API GL-5 rating. \u003c\/p\u003e\u003ch3\u003eBuild options\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eStart Your Build: In Stock 3rd. Member, Build To Order 3rd. Member\u003c\/li\u003e\n\u003cli\u003eGear Case: Currie Sportsman Nodular Iron Case - Loaded\u003c\/li\u003e\n\u003cli\u003ePinion Support: Currie Iron Big Bearing Pinion Support, Aluminum Big Bearing Pinion Support (Red)\u003c\/li\u003e\n\u003cli\u003eRatio, Differential, Yoke: 3.00 Ratio, TwinTrac, 1350 Yoke, 3.25 Ratio, TwinTrac, 1350 Yoke, 3.50 Ratio, TwinTrac, 1350 Yoke, 3.70 Ratio, TwinTrac, 1350 Yoke, 3.89 Ratio, TwinTrac, 1350 Yoke, 4.11 Ratio, TwinTrac, 1350 Yoke\u003c\/li\u003e\n\u003cli\u003eRatio, Differential, Yoke: 3.00 Ratio, TwinTrac, 1350 Chromoly Yoke, 3.25 Ratio, TwinTrac, 1350 Chromoly Yoke, 3.50 Ratio, TwinTrac, 1350 Chromoly Yoke, 3.70 Ratio, TwinTrac, 1350 Chromoly Yoke, 3.89 Ratio, TwinTrac, 1350 Chromoly Yoke, 4.11 Ratio, TwinTrac, 1350 Chromoly Yoke\u003c\/li\u003e\n\u003cli\u003eGear Case: Currie Sportsman Nodular Iron Case - Loaded, HD-Pro Aluminum Gear Case - Loaded\u003c\/li\u003e\n\u003cli\u003eAdd Load Bolt: No Load Bolt, Load Bolt Assembly\u003c\/li\u003e\n\u003cli\u003ePinion Support: Currie Iron Big Bearing Pinion Support, Aluminum Big Bearing Pinion Support (Red)\u003c\/li\u003e\n\u003cli\u003eSelect Gear Ratio: 3.00 Gears, 3.25 Gears, 3.50 Gears, 3.50 Gears Polished, 3.70 Gears, 3.70 Gears Polished, 3.89 Gears, 3.89 Gears Polished, 4.11 Gears, 4.11 Gears Polished, 4.30 Gears, 4.56 Gears, 4.86 Gears, 5.14 Gears, 5.29 Gears\u003c\/li\u003e\n\u003cli\u003eSelect Differential: ARB Air Locker, Currie TwinTrac, Eaton Truetrac, Open Diff, Spool, Wavetrac\u003c\/li\u003e\n\u003cli\u003eARB Setup: ARB Setup Labor\u003c\/li\u003e\n\u003cli\u003eSelect Yoke: 1330 Big Cap Nodular Iron Yoke, 1350 Nodular Iron Yoke, 1350 Chromoly Yoke\u003c\/li\u003e\n\u003cli\u003ePinion Yoke: 1350 Chromoly Yoke\u003c\/li\u003e\n\u003cli\u003eIncluded Shipping\/Storage Box: Shipping\/Storage Box\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProduct information\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart numbers vary by build options\u003c\/li\u003e\n\u003cli\u003eBrand: Currie Enterprises\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Currie Enterprises","offers":[{"title":"Default Title","offer_id":45919751307330,"sku":null,"price":1218.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1476\/5984\/files\/0019300_ford-9-inch-third-member-assembly-31-spline.jpg?v=1794111717","url":"https:\/\/www.skinnypedalracing.com\/products\/currie-ford-9-inch-third-member-assembly-31-spline","provider":"Skinny Pedal Racing","version":"1.0","type":"link"}