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USA Standard Rear Axle Shaft for 1965-1969 4WD GM Truck – 12-Bolt, 30 Spline
The 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.
What's Included
- 1 x ZA G3893605 rear axle shaft (one side)
Features and Benefits
- Correct replacement for 1965-1969 4WD GM truck with 12-bolt rear
- 30-spline inner engagement for factory carrier compatibility
- 6-lug bolt pattern matches original wheel bolt circle
- 30-3/4-inch overall length matches OEM specification
- Alloy steel with heat treatment for strength and durability
- Lifetime limited warranty under Magnuson-Moss Warranty Act
Specifications
| Specification | Detail |
|---|---|
| Part Number (MPN) | ZA G3893605 |
| Differential Application | GM 12-bolt truck |
| Axle Length | 30-3/4 inches |
| Spline Count | 30-spline |
| Lug Pattern | 6-lug |
| Fitment | 1965-1969 4WD Chevrolet/GMC C/K truck |
| Warranty | Lifetime limited |
| UPC | 883584016819 |
Why Choose ZA G3893605 for Your Classic Truck Build
Original 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.
Frequently Asked Questions
- Does ZA G3893605 fit 1963-1964 GM trucks? The ZA G3893605 is fitment-verified for 1965-1969 4WD GM trucks with the 12-bolt differential. Earlier trucks may use different shaft lengths.
- Is this shaft compatible with a posi unit? Yes. The 30-spline ZA G3893605 engages the factory carrier whether it is an open differential or a factory-style limited-slip posi unit.
- Does ZA G3893605 fit the 2WD version of these trucks? The ZA G3893605 is specified for 4WD applications. 2WD shaft dimensions may differ.
- Do I need to replace the axle bearing when installing ZA G3893605? Inspecting and replacing the axle shaft bearing and seal at the same time is strongly recommended on any vintage restoration build.
- Is the 12-bolt differential stronger than the 10-bolt? 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.
- Will ZA G3893605 accept aftermarket lockers? Most lockers designed for the GM 12-bolt truck with 30-spline axles will work with ZA G3893605. Confirm your locker's spline requirement.
- What is the warranty on ZA G3893605? Lifetime limited warranty from Yukon Gear and Axle under the Magnuson-Moss Warranty Act.
- What gear oil should I use after installation? Use 80W-90 or 75W-90 gear oil appropriate for your carrier type. Add limited-slip additive if your posi unit requires it.
Installation Instructions
Raise 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.
Prop 65 Notice
This 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.
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