Drivetrain› Differentials and Rear-End Components

Richmond Gear

Pro Gear Set 4.33 Ratio GM 12-Bolt

$675.00

SKU: RP12B433

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In Stock
Ships by Aug 5
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INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Richmond Gear RP12B433 is a Pro Gear Set designed for GM 12-bolt car differentials, featuring a 4.33 gear ratio. These gears are specifically produced from 9310 forged steel and undergo a heat-treatment process to optimize material properties for enhanced durability. The expected lifespan can range from 15 to 300 runs, depending on the vehicle's application. This set is designed for use with 4.11 and numerically higher carriers. Important fitment information: This gear set will not fit truck rear ends. It includes a ring gear with an 8.875" OD, 39 teeth, 12 bolt holes, and 3/8"-24 RH threads, along with a pinion with a 30 spline shaft, 9 teeth, and 7/8"-16 RH threads.

MIA's Description

The Richmond Gear RP12B433 is a Pro Gear Set for GM 12-bolt car differentials with a 4.33 ratio. These gears are produced from 9310 forged steel and are heat-treated.

Fitment

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Specifications

BrandRichmond Gear
Part NumberRP12B433
CategoryDrivetrain

Buy with Confidence

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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