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Drivetrain› Differentials and Rear-End Components

USA Standard Gear

GM 12 Bolt Rear Axle Shaft

Name: GM 12 Bolt Rear Axle Shaft
Brand: USA Standard Gear
SKU: ZA K630138

$193.72

SKU: ZA K630138

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$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

Built with advanced alloys and cutting-edge heat-treating, these axles offer enhanced strength and durability for tough conditions. This kit is for GM 12 Bolt Passenger Cars and includes a 30 spline, 30 1/8" long rear axle shaft, featuring a 5x4.75" bolt pattern.

Show original supplier description

The USA Standard Gear Rear Axle Kit is engineered as a direct-fit replacement, ensuring it integrates seamlessly with your vehicle's existing drivetrain components. This combination provides superior strength and durability, making them reliable for both daily driving and more demanding off-road adventures. This kit specifically targets GM 12 Bolt Passenger Cars, offering a robust solution for replacement or upgrade. Each kit features a rear axle shaft with a 30 spline count and a length of 30 1/8 inches, complemented by a 5x4.75-inch bolt pattern. The package is comprehensive, including a wheel bearing, seal, studs, and lug nuts, providing everything necessary for a proper installation. Note that if a full axle replacement is needed, you may require more than one kit. This USA Standard Gear axle is compatible with the following vehicles: Chevrolet Camaro 1970 Chevrolet Chevelle 1968-1972 Chevrolet El Camino 1968-1972 Chevrolet Monte Carlo 1970-1972 GMC Sprint 1971-1972 Pontiac Firebird 1970

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	USA Standard Gear
Part Number	ZA K630138
Category	Drivetrain

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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