{"product_id":"9-inch-helical-gear-posi-3rd-member-assembly","title":"9-inch Helical Gear Posi 3rd Member Assembly","description":"The Speedway Motors Ford 9-inch Helical Gear Posi 3rd Member Assembly is meticulously hand-assembled by trained experts in-house, ensuring a precise, step-by-step process with quality components at a competitive price. The core of this assembly is a new nodular (ductile) iron center section, fortified with over 4 lbs. of additional material in critical areas to enhance its resistance to fracturing compared to standard OEM \"gray\" iron. This robust housing is further reinforced with extra ribbing and thick, forged steel bearing caps secured by precision Grade 8 cap screws. Billet steel adjuster nuts and heavy-duty keepers ensure the ring gear settings remain exact, while precision-machined mounting surfaces guarantee a flat, consistent gasket seal to prevent leaks.\n\nPrecision is paramount in ensuring the correct ring gear teeth pattern. Speedway Motors employs a time-proven, step-by-step process to achieve the correct backlash, preload, and pinion shims. The gears themselves are constructed from cold-rolled 8620 steel, known for its exceptional wear resistance and durability. A stronger \"Daytona\" style pinion bearing support is utilized to maintain critical pinion depth settings under high load, offering superior reliability over traditional crush sleeves. The assembly includes a forged steel \"Ford short\", 1310-type pinion yoke. Note that the 1310 series U-Joint and bearing cap retainers are sold separately.\n\nThe helical-gear style limited-slip differential offers quiet operation without the clicking often associated with other limited-slip units. It functions like an open differential under normal driving conditions but automatically transfers torque to the wheel with the most traction when needed, providing smooth and unnoticed power transfer. This design offers the traction benefits of a limited-slip differential without the expense and noise of a full locker. The unit is built for proven reliability, featuring tapered steel roller bearings, Grade 9 ring gear bolts (15% stronger than Grade 8), heavy-duty Grade 8 carrier cap bolts, and a lock-style pinion nut with pre-applied Loctite. A Viton® pinion seal is included for long-lasting oil and chemical resistance up to 399°F (204°C).","brand":"Speedway","offers":[{"title":"Default Title","offer_id":52663778902328,"sku":"91049349","price":1093.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687713028.jpg?v=1784329534","url":"https:\/\/store.motormia.co\/products\/9-inch-helical-gear-posi-3rd-member-assembly","provider":"MOTORMIA","version":"1.0","type":"link"}