Zumbrota Drivetrain

Remanufactured Rear Axle Assembly 3.73 Ratio GT4 Posi

$1,899.89

SKU: RAA435-1957A

In Stock
In Stock
Ships by Sep 1
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Zumbrota Drivetrain RAA435-1957A is a remanufactured rear axle assembly designed for 1999-2005 GM 2500 Pickup trucks. This robust assembly features a 10.5-inch ring gear with a 3.73 gear ratio, designated by the GT4 ratio option code. It is equipped with a Posi Limited Slip Differential for enhanced traction and an 8-bolt full float axle configuration. The inclusion of the G80 Posi Traction system ensures improved performance in various driving conditions. Key specifications include a 10.5-inch ring gear diameter and a 3.73 ratio. This unit is built upon an 8-bolt full float axle and comes with the G80 Posi Traction feature. Importantly, it does not include hubs, brakes, backing plates, or axle shafts, and is specified as being without Quadrasteer. This rear axle assembly is specifically designed for the 1999-2005 model years of the GM 2500 Pickup. It is a remanufactured component, built to restore functionality and performance to your drivetrain.

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.

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Specifications

BrandZumbrota Drivetrain
Part NumberRAA435-1957A
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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