My Account
My Garage
Shopping Cart
MY GARAGE Select Vehicle
MY GARAGE

Yukon Gear & Axle YA FMUST-1-31 31 Spline 4 Lug Axle Kit with DuraGrip Positraction for Ford 8.8

Manufacturer

Yukon Gear & Axle

<h3>Hardcore Drivetrain Components Since 1983</h3> <p>Founded in 1983 and headquartered in Everett, Washington, Yukon Gear & Axle has built a reputation as one of the most trusted names in drivetrain engineering. With over four decades of experience, this privately-held manufacturer specializes in high-performance gears, axles, lockers, and differential components designed to withstand the most demanding conditions. Whether you're building a rock crawler, upgrading a daily driver after installing larger tires, or competing on the drag strip, Yukon's comprehensive product lineup delivers the strength and precision fitment that serious enthusiasts demand.</p> <p>What sets Yukon apart is their commitment to in-house engineering and rigorous quality control. Their engineering team uses advanced CAD software to design components that are then manufactured by top-tier OEM partners using state-of-the-art heat-treating techniques and precision machining. Every product undergoes extensive testing to ensure it meets exacting specifications for tooth contact, surface finish, and structural integrity. This attention to detail has made Yukon the benchmark for quality in the automotive gear industry, trusted by professional installers and weekend warriors alike.</p> <h3>Performance Ring & Pinion Gears</h3> <p>At the heart of Yukon's product range are their <a href="/3073-yukon-gear-axle-differential-ring-and-pinion-10438">differential ring and pinion</a> gear sets, engineered to handle high torque and extreme demands. Available in one of the widest selections of gear ratios on the market, these gears allow you to optimize your vehicle's performance for specific applications—whether you need better low-end torque for crawling, improved fuel economy, or the right rpm range for maximum horsepower. Each gear set is backed by Yukon's Y.E.S. Plan, a lifetime no-questions-asked replacement warranty that protects your investment for as long as you own your vehicle.</p> <h3>Complete Differential Solutions</h3> <p>Rebuilding a differential requires more than just gears, which is why Yukon offers comprehensive <a href="/3073-yukon-gear-axle-differential-rebuild-kit-18601">differential rebuild kits</a> and master overhaul kits that include everything needed for a reliable installation. These kits bundle premium Timken bearings, shims, seals, crush sleeves, and all the small hardware required to complete the job correctly the first time. For more extensive upgrades, Yukon's <a href="/3073-yukon-gear-axle-differential-2304">differentials</a> include their Dura Grip limited-slip units and Grizzly Locker automatic lockers, which provide smooth yet aggressive traction across varied terrain. Proudly assembled in the USA, these traction devices deliver the confidence and performance needed for serious off-road adventures or competitive motorsports.</p> <h3>Strength Where It Counts</h3> <p>When upgrading to larger tires or increasing horsepower, your factory <a href="/3073-yukon-gear-axle-axle-shaft-10439">axle shafts</a> often become the weak link in the drivetrain. Yukon addresses this with a complete line of upgraded axle shafts engineered for superior strength and reliability. For vehicles equipped with manual locking hubs, Yukon also manufactures durable <a href="/3073-yukon-gear-axle-locking-hub-body-assembly-19491">locking hub body assemblies</a> that provide dependable engagement when you need 4WD capability. These components are designed to work seamlessly with Yukon's gears and lockers, creating a complete drivetrain solution that won't let you down on the trail or at the track.</p> <p>Whether you're a professional shop looking for reliable parts or an enthusiast tackling your first re-gear project, Yukon Gear & Axle offers the quality, selection, and technical support to get the job done right. Their commitment to continuous improvement—often incorporating customer feedback into product development—ensures that every component meets the real-world needs of drivers who demand performance and durability from their vehicles.</p>

Part Number

YA FMUST-1-31
09/08/2036 11:33 PM
Sale Price

$773.14

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Yukon Gear & Axle YA FMUST-1-31 is a complete rear axle upgrade kit designed specifically for 1979-1993 Ford Mustangs equipped with the Ford 8.8" rear differential. This comprehensive kit provides everything needed to upgrade your Mustang's rear end with stronger 31-spline axles and a DuraGrip limited-slip differential for improved traction and performance.

Key Features:

  • 31-spline C-clip axle shafts for increased strength over factory 28-spline axles
  • 4-lug pattern configuration maintains compatibility with factory wheels
  • DuraGrip Positraction limited-slip differential for enhanced traction and corner exit performance
  • Complete installation hardware including carrier bearings, races, and Supershim kit
  • Premium axle bearings and seals ensure reliable, leak-free operation
  • Wheel studs included for complete bolt-in installation

This kit is ideal for Mustang owners looking to upgrade from worn factory components or improve traction for street performance and weekend driving. The 31-spline axles provide a significant strength upgrade over stock 28-spline axles, while the DuraGrip limited-slip unit delivers predictable power transfer to both rear wheels. All necessary bearings, seals, and installation shims are included for a complete rear end rebuild in one package.

Products specifications

Position

Rear

WARNING CA Proposition 65

Yes

Arrived fairly quickly. Genuine parts and cheaper than Amazon.

Great experience

So simple, especially being linked to from Google Shopping. All I had to do was confirm my year/make/model, and voila!

Great!

Just what we need. It was a pleasure doing business with you. Thank you!

Fast shipping, exactly what I was looking for, at the best price I could find! Thanks!!

The part I purchased had the lowest price I could find online anywhere.. Simple transaction and fast shipping.. Ordered on a Monday and delivered by Friday..

I am very pleased with my purchase from Autoplicity. Price was very reasonable and shipping was great!

a lot of their parts are the lowest price you can find. they will always be on my list of autopart dealers for every build

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy