Drivetrain› Differentials and Rear-End Components

Zumbrota Drivetrain

4.11 Posi LSD Differential Housing Assembly

$4,420.89

SKU: RAA435-1980B

Special Order
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Zumbrota Drivetrain Reman Axle Assembly is a fully remanufactured unit for Ford 10.5" applications from 1999-2000.

This assembly features a 4.11 ring and pinion ratio and a Posi Limited Slip Differential (LSD) for enhanced traction. This includes inspection and straightening of tubes, testing housings for wear and cracks, and a 100% inspection of all internal components. Bearings, seals, crush sleeves, pinion nuts, and shims are all replaced. The housing is hydro-blasted to an OEM finish, and correct rolling torque is established for precision setup and longevity.
Show original supplier description
The Zumbrota Drivetrain RAA435-1980B-P is a remanufactured axle assembly designed for 1999-2000 Ford F-350 trucks with a 10.5-inch axle. This unit comes equipped with a 4.11 ring and pinion ratio and a Posi Limited Slip Differential (LSD), making it suitable for Dual Rear Wheel (DRW) applications. Each axle assembly is meticulously remanufactured by Zumbrota Drivetrain. The process involves a thorough inspection of all tubes for straightness, surface wear, and cracks. Internal components, including the ring and pinion, gears, clutches, and carrier, are also inspected 100%. All critical wear items such as bearings, seals, crush sleeves, pinion nuts, and shims are replaced with new parts to ensure optimal performance and durability. The housings are hydro-blasted to restore them to an OEM finish, and precise setup is guaranteed through the establishment of correct rolling torque. This remanufactured axle assembly is built to stringent quality standards, ensuring reliability and longevity for your heavy-duty Ford truck. The company offers a core charge system, where a deposit is paid upfront and refunded upon the return of your old, salvageable part for recycling or rebuilding.

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

BrandZumbrota Drivetrain
Part NumberRAA435-1980B
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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