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Yukon Gear 9in 31Spline (69-73Mustang & Others) Axle Seal

Yukon Gear & Axle
YUKYMS9363S
Out of stock
Differential Seal Kits
$19.89
If you're restoring a classic or fixing a rear-end leak, the rear axle seal from Yukon...
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Yukon Gear 9in 31Spline (69-73Mustang & Others) Axle Seal
Description

If you're restoring a classic or fixing a rear-end leak, the rear axle seal from Yukon Gear is the upgrade that keeps your differential clean and protected. Designed for 9" 31-spline axles found in 1969–1973 Mustangs and similar vehicles, this Mighty Seal delivers a tight, leak-free fit that locks in gear oil and keeps contaminants out.

Built with premium-grade rubber and composite materials, the Yukon Gear rear axle seal resists heat, friction, and wear. It’s engineered for a specific fit, making installation easy and reliable. Whether you're cruising the boulevard or hitting the strip, this seal is built to perform under pressure.

This rear axle seal is ideal for classic car owners, weekend wrenchers, and performance builders who want peace of mind and long-term durability. It’s a small part that plays a big role in keeping your rear end sealed and running smooth.


Features and Benefits

  • Fits 9" 31-Spline Rear Axles – Designed for 1969–1973 Mustang and similar models.

  • Specific Fit Design – Ensures precise alignment and easy installation.

  • Durable Composite Construction – Resists heat, wear, and contamination.

  • Leak-Free Performance – Keeps gear oil sealed in and debris out.

  • OEM-Compatible Dimensions – Matches factory specs for a perfect fit.


Seal Your Rear End Right

Tired of spotting gear oil under your classic ride? The rear axle seal from Yukon Gear is the simple solution that locks in performance and protects your differential. Whether you're restoring or racing, this seal keeps your axle clean and tight.


Specifications

Specification Details
Part Number yukYMS9363S
Fitment 9" 31-Spline Rear Axles (69–73 Mustang & Others)
Position Rear
Color Black
Universal or Specific Fit Specific Fit
California Proposition 65 Not Applicable
Package Quantity 1 EA


Installation Instructions
Installation Instructions


This Part Fits:

 

Year Make Model Submodel
1967-1970 Ford Fairlane 500
1967 Ford Fairlane 500XL
1967-1969 Ford Fairlane Base
1972 Ford Gran Torino Base
1972 Ford Gran Torino Sport
1972 Ford Gran Torino Squire
1969-1973 Ford Mustang Base
1969-1971 Ford Mustang Boss 302
1971-1972 Ford Mustang Boss 351
1969-1970 Ford Mustang Boss 429
1970-1973 Ford Mustang Grande
1970-1973 Ford Mustang Mach 1
1969-1970 Ford Mustang Shelby GT-350
1969-1970 Ford Mustang Shelby GT-500
1967-1972 Ford Ranchero 500
1967 Ford Ranchero 500 XL
1967-1971 Ford Ranchero Base
1968-1972 Ford Ranchero GT
1970-1972 Ford Ranchero Squire
1972 Lincoln Continental Base
1969,1971 Mercury Comet Base
1967-1973 Mercury Cougar Base
1969-1970 Mercury Cougar Boss 302
1969-1970 Mercury Cougar Boss 429
1969-1970 Mercury Cougar Cobra Jet
1967-1973 Mercury Cougar XR-7

REVIEWS

TC

Used this seal on my '70 Mustang and it fit like a glove. No leaks, no drama—just solid performance. Great quality from Yukon as always.

Tom C.

Salem, OR

★★★★★
LS

Dropped this into my Bronco build and it’s been bone dry ever since. Easy install and great fit. Highly recommend for any 9" rear axle setup.

Logan S.

Reno, NV

★★★★★
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Effective Date: October 2024
We offer a 30-day return policy, allowing you to request a return within 30 days of receiving your item. To qualify for a return, the item must be in its original condition—unused, with tags, and in its original packaging. A receipt or proof of purchase is also required.

To initiate a return, please contact us at info@riotparts.com. Returns must be shipped to the address provided upon request. If your return is approved, we will issue a return shipping label along with detailed instructions.

Important
Returns sent without prior authorization will not be accepted.

For any return-related inquiries, please reach out to us at info@riotparts.com.

Return Shipping Address
The return shipping address will be determined based on the requestor’s location to ensure the nearest return facility is used.

Possible return locations include:
• 10880 Lear Blvd.
Reno, NV 89506, United States
• 931 W. Bardin Rd., Suite 150–200
Arlington, TX 76017, United States
• 3035 Campus Dr.
Hatfield, PA 19440, United States
• 5789 N. Graham Road, Ste 200
Whiteland, IN 46184, United States
• 2020 NE Aloclek Dr 4711 N Lamon Ave
#118 STE 12, Hillsboro, OR 97124, United States

Damages and Issues
We recommend inspecting your order upon receipt. If you find that an item is defective, damaged, or if you received the wrong item, please contact us immediately so we can address the issue.

Exceptions / Non-Returnable Items
Certain items cannot be returned, including:
• Electrical parts that have been installed or used
• Special order parts that were custom ordered for you
• Items that have been damaged due to improper installation or use

If you have questions or concerns about a specific item, please contact us for assistance.

Exchanges
For exchanges, the quickest option is to return the item you have. Once the return is accepted, you can make a separate purchase for the new item.

Refunds
We will notify you once we receive and inspect your return to inform you whether your refund is approved. If approved, you will be automatically refunded using your original payment method within 10 business days. Please be aware that it may take additional time for your bank or credit card company to process and post the refund.

If more than 15 business days have passed since your return was approved and you haven’t received your refund, please contact us at info@riotparts.com.

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