{"product_id":"usa-standard-rear-axle-1965-1969-4wd-gm-truck-12-bolt","title":"USA Standard Axle For 65-69 4Wd GM Truck","description":"\u003ch4\u003eUSA Standard Rear Axle Shaft for 1965-1969 4WD GM Truck – 12-Bolt, 30 Spline\u003c\/h4\u003e\n\u003cp\u003eThe USA Standard ZA G3893605 is a high-quality replacement rear axle shaft engineered for 1965-1969 four-wheel-drive Chevrolet and GMC truck applications equipped with the iconic GM 12-bolt rear differential. The ZA G3893605 features a 30-spline inner engagement for proper carrier fit, a 6-lug bolt pattern matching the factory wheel bolt circle, and an overall length of 30-3\/4 inches to match the factory shaft specification. USA Standard manufactures ZA G3893605 from alloy steel with heat-treatment processes that meet or exceed the tensile and fatigue requirements of the original application. These mid-1960s 4WD GM trucks are popular restoration and restomod platforms, and the ZA G3893605 provides a new, warrantied replacement that avoids the uncertainty of reusing a 60-year-old original shaft. The ZA G3893605 is backed by a lifetime limited warranty from Yukon Gear and Axle under the Magnuson-Moss Warranty Act.\u003c\/p\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1 x ZA G3893605 rear axle shaft (one side)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFeatures and Benefits\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCorrect replacement for 1965-1969 4WD GM truck with 12-bolt rear\u003c\/li\u003e\n\u003cli\u003e30-spline inner engagement for factory carrier compatibility\u003c\/li\u003e\n\u003cli\u003e6-lug bolt pattern matches original wheel bolt circle\u003c\/li\u003e\n\u003cli\u003e30-3\/4-inch overall length matches OEM specification\u003c\/li\u003e\n\u003cli\u003eAlloy steel with heat treatment for strength and durability\u003c\/li\u003e\n\u003cli\u003eLifetime limited warranty under Magnuson-Moss Warranty Act\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003eZA G3893605\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDifferential Application\u003c\/td\u003e\n\u003ctd\u003eGM 12-bolt truck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAxle Length\u003c\/td\u003e\n\u003ctd\u003e30-3\/4 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpline Count\u003c\/td\u003e\n\u003ctd\u003e30-spline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLug Pattern\u003c\/td\u003e\n\u003ctd\u003e6-lug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003e1965-1969 4WD Chevrolet\/GMC C\/K truck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e883584016819\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose ZA G3893605 for Your Classic Truck Build\u003c\/h4\u003e\n\u003cp\u003eOriginal 1965-1969 GM axle shafts are now 55-plus years old. Even if they appear visually intact, metal fatigue and stress cycling from decades of use make original shafts a liability on a restored or restomod truck. The ZA G3893605 provides a new, OEM-specification replacement with a lifetime warranty — giving you peace of mind that your classic truck's axle shafts are in verified, like-new condition.\u003c\/p\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes ZA G3893605 fit 1963-1964 GM trucks?\u003c\/strong\u003e The ZA G3893605 is fitment-verified for 1965-1969 4WD GM trucks with the 12-bolt differential. Earlier trucks may use different shaft lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs this shaft compatible with a posi unit?\u003c\/strong\u003e Yes. The 30-spline ZA G3893605 engages the factory carrier whether it is an open differential or a factory-style limited-slip posi unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDoes ZA G3893605 fit the 2WD version of these trucks?\u003c\/strong\u003e The ZA G3893605 is specified for 4WD applications. 2WD shaft dimensions may differ.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo I need to replace the axle bearing when installing ZA G3893605?\u003c\/strong\u003e Inspecting and replacing the axle shaft bearing and seal at the same time is strongly recommended on any vintage restoration build.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs the 12-bolt differential stronger than the 10-bolt?\u003c\/strong\u003e Yes. The GM 12-bolt is the stronger of the two and is prized in the muscle car and truck community for its durability and gear availability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWill ZA G3893605 accept aftermarket lockers?\u003c\/strong\u003e Most lockers designed for the GM 12-bolt truck with 30-spline axles will work with ZA G3893605. Confirm your locker's spline requirement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the warranty on ZA G3893605?\u003c\/strong\u003e Lifetime limited warranty from Yukon Gear and Axle under the Magnuson-Moss Warranty Act.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat gear oil should I use after installation?\u003c\/strong\u003e Use 80W-90 or 75W-90 gear oil appropriate for your carrier type. Add limited-slip additive if your posi unit requires it.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003cp\u003eRaise and support the vehicle. Remove the wheel and brake drum. Remove the retaining plate bolts from the housing flange. Slide the old shaft out. Install ZA G3893605 by sliding it into the housing and engaging the splines with the carrier side gear. Reinstall the retaining plate, drum, and wheel. Torque to specification and road test.\u003c\/p\u003e\n\n\u003ch4\u003eProp 65 Notice\u003c\/h4\u003e\n\u003cp\u003eThis product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"Yukon Gear \u0026 Axle","offers":[{"title":"Default Title","offer_id":45974397976655,"sku":"YUKZA G3893605","price":173.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/USA_Standard_65-69_4WD_GM_Truck.png?v=1782657962","url":"https:\/\/www.blackopsautoworks.com\/products\/usa-standard-rear-axle-1965-1969-4wd-gm-truck-12-bolt","provider":"Black Ops Auto Works","version":"1.0","type":"link"}