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

2025-09-10T01:25:03-06:00

Price: 19.89

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

★★★★★