BCHD PT3604 Differential Pinion Seal - Front Outer or Rear Outer

Differential Pinion Seal for Ford Applications

PT3604 is a differential pinion seal for Ford, Lincoln, Mazda, and Mercury driveline applications. It is listed for front outer and rear outer positions, with fitment tied to specific axle and ring gear configurations. PT3604 is a direct replacement part number to verify against the original seal before service.

Key Features

• Direct replacement differential pinion seal for driveline sealing service.
• Fits a wide range of Ford F-150, Ford Mustang, and Ford Explorer applications.
• Application-specific fitment by axle and ring gear size, including 7.5-inch, 8.8-inch, and other listed configurations.
• Supports front outer and rear outer pinion seal locations where specified in the fitment data.
• Part number PT3604 for catalog and service reference.

Detailed Description

PT3604 is used to seal the differential pinion area and help maintain proper lubricant retention in the axle assembly. The fitment data covers many Ford truck, SUV, and car platforms, including Ford F-150, Ford Mustang, and Ford Explorer, with notes that distinguish axle size and design variations. Because the application depends on ring gear size and axle configuration, matching the original seal dimensions and axle details is important before installation. This part number PT3604 is also referenced across multiple Ford, Lincoln, Mazda, and Mercury rear axle applications.

What It Is Used For

• Replacing a leaking pinion seal at the differential.
• Restoring axle lubricant containment.
• Addressing seepage around the pinion area.
• Supporting service on worn or aged rear axle sealing surfaces.
• Matching axle-specific service requirements on Ford F-150 and Ford Mustang driveline setups.

Installation Notes and Tips

Confirm the axle type, ring gear size, and position before ordering or installing PT3604. The fitment list includes multiple design variations, so the original seal should be matched to the vehicle’s axle configuration rather than the model name alone. Clean the sealing surface thoroughly and inspect the pinion area for wear before assembly. Verify compatibility against the listed notes for Ford Expedition, Ford Ranger, and Lincoln Navigator applications where applicable.

Quality Assurance

Use the fitment notes and part number PT3604 to confirm the correct application before service. This seal is cataloged for a broad range of axle configurations across Ford, Lincoln, Mazda, and Mercury platforms.