Drivetrain Differentials and Rear-End Components

GM

Eaton Limited-Slip Positraction Unit

$657.00

SKU: POSI-GM8.5-RA

In Stock
In Stock
Ships by Jul 29
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30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The GM POSI-GM8.5-RA is a limited-slip positraction unit engineered for GM 8.5" 10-bolt differentials, specifically designed to fit between the model years 1970 and 1998. This unit utilizes an Eaton style carrier and is compatible with 28-spline axles. Constructed with a combination of carbon fiber and steel friction materials, the POSI-GM8.5-RA aims to provide robust performance and durability. Its design focuses on enhancing traction by distributing power between the wheels, preventing wheel slip during acceleration and in low-traction conditions. This positraction unit is a direct replacement for many GM rear axle applications, simplifying the installation process for mechanics and enthusiasts alike. Proper installation may require additional components such as gears, bearings, and an install kit, which are often sold separately.

Fitment

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Specifications

BrandGM
Part NumberPOSI-GM8.5-RA
CategoryDrivetrain

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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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