Sale

USA Standard Gear

GM 12T Ring and Pinion Set 3.08 Ratio

$405.41 $378.89 Save $26.52

SKU: ZG GM12T-308

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

Description

This set features an 8.875-inch ring gear diameter, a 30-spline pinion, and is secured with 12 ring gear bolts, ensuring a robust and reliable connection. The 3.08 gear ratio is carefully chosen to strike an optimal balance between low-end torque for hauling and towing, and efficiency for highway cruising. It is specifically designed to fit GM 12-bolt truck applications. Compatible vehicles include a wide range of Chevrolet and GMC trucks and SUVs such as the Chevrolet Blazer (1969-1974, 1987), C/K 10 (1963-1986), G10 (1975-1981), K5 Blazer (1975-1986), Suburban (1963-1988), and various GMC C/K 1500 and G-series vans and trucks from the mid-1960s through the late 1980s. USA Standard Gear stands behind its products with a 1-year warranty against manufacturer defects, offering peace of mind for rebuilds, enhancements, or restorations. Customer feedback highlights improved power delivery, smoother torque, and better handling after installation.

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-308
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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