Drivetrain› 4x4 Driveline Components

Yukon Gear & Axle

USA Standard 4340 Chrome Moly Axle Shaft / Left Hand Inner For 79+ GM Truck & Blazer 8.5in 30 Spline

$447.03

SKU: Y001 ZA W39255

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Yukon Gear & Axle inner axle shaft is a heavy-duty component designed for GM 8.5” differentials. Constructed from 4340 chromoly, this left-hand inner axle measures 35.46 inches long and features 30 splines. It is engineered for use with the 5-760X series U-joint and fits 1979 and newer GM trucks and Blazers.

Fitment

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Specifications

BrandYukon Gear & Axle
Part NumberY001 ZA W39255

Videos

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How To: Rebuild a GM 8.5" Rear Axle 10 Bolt Chevy
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How-to Install a Spartan Locker in a GM 8.5 10-Bolt (No Gear Reset Needed)
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Yukon Gear vs USA Standard Gear Axles
How to Install a Yukon Driveshaft - Jeep JK

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Helpful Tools for Differential Repair

Helpful Tools for Differential Repair
Wrangler JK Yukon Rear Axle Upgrade | Building the Strongest Rear Dana 44 Ep .2

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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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