Zumbrota Drivetrain

88 Kit 31 Spline 4340 Chromoly Differential Upgrade Kit

$1,017.89

SKU: YA WF88-31-KIT

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

Description

The Yukon Ultimate 88 Kit is a premium differential upgrade designed for Ford 8.8” differentials. Constructed from high-tensile strength 4340 chromoly, these axles are built for unmatched quality and durability, featuring superior production methods like cold roll formed splines and advanced heat treating. This comprehensive kit specifically targets Ford 8.8” differentials and includes 31 spline axles. A key feature is the elimination of the factory C-clips, which simplifies installation and enhances reliability. The axles are double-drilled to accommodate both 5 x 4.5” and 5 x 5.5” wheel bolt patterns, offering versatility for various applications. Installation of this kit will also increase the overall axle width by approximately 1 inch per side. This kit is designed for Ford 8.8” differentials, specifically those compatible with the Ultimate 88 kit. The 4340 chromoly construction ensures robust performance and longevity under demanding conditions.

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 NumberYA WF88-31-KIT
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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