USA Standard Gear

4.56 Ring and Pinion Gear Set

$254.71

SKU: ZG GM12T-456

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The USA Standard Gear ZG GM12T-456 is a replacement ring and pinion gear set specifically engineered for GM 12 bolt truck axles. This set offers a 4.56 gear ratio, a substantial 8.875-inch ring gear diameter, 12 ring gear bolts, and a 30-spline pinion. USA Standard Gear is committed to producing components that surpass original equipment manufacturer standards. Each gear set is subjected to stringent internal quality control measures, encompassing testing for dimensions, materials, and overall fitment, ensuring a reliable upgrade for your drivetrain. This ring and pinion set is compatible with a wide range of Chevrolet and GMC trucks, Blazers, and Suburbans from 1979 to 1988, specifically those equipped with the GM 12-bolt rear axle. This includes models like the C10, K10, C1500, K1500, G1500, R10, V10, K5 Blazer, and Suburban, covering both 2WD and 4WD configurations where applicable. Always verify your specific axle configuration before purchase.

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

BrandUSA Standard Gear
Part NumberZG GM12T-456
CategoryDrivetrain

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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.

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