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View listing at Fordpartsgiant; opens in a new tabS197 Mustang · Buyer's guide
S197 Mustang Axle Vent, Differential Cover and Pinion-Seal Leaks
2005-2014 Mustang solid rear axle. Confirm 7.5-inch versus 8.8-inch axle, ratio/differential, production and special-model exclusions before buying cover or service parts.
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WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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What you need to know
Clean and identify the leak at vent, cover seam/fill plug, axle seals or pinion. Pinion-seal service affects flange/nut and bearing preload procedure; do not treat it as a casual pry-and-replace seal job. Confirm axle size and special-model exclusions.
OEM numbers
Vent 4R3Z-4022-AA replaces E4LY-4022-A for checked applications. Pinion seal BR3Z-4676-A replaces F89Z-4676-AA and E8TZ-4676-C. Covers and fill hardware depend on axle/special-model configuration.Supersession
E4LY-4022-A -> 4R3Z-4022-AA vent and E8TZ-4676-C/F89Z-4676-AA -> BR3Z-4676-A pinion seal are supported. These separate service items do not form one repair chain.
Fitment
Clean and identify the leak at vent, cover seam/fill plug, axle seals or pinion. Pinion-seal service affects flange/nut and bearing preload procedure; do not treat it as a casual pry-and-replace seal job. Confirm axle size and special-model exclusions.
Aftermarket options
Genuine vent/seal, Timken seal and replacement/girdle covers are available. An upgraded cover does not repair a blocked vent or pinion-seal/preload problem.
Before you buy
Confirm axle size and special-model exclusions. Diagnose vent, cover, axle seal and pinion seal separately. Pinion-seal work can affect bearing preload and should follow Ford procedure or be handled by a qualified driveline professional.
Research and fitment sources
Supersede reviewed 8 unique research sources for this guide. 4 also appear above as a seller or official action and are not repeated here; 4 additional citations follow.
Research last verified .