SKF 12456 Manual Transmission Seal - Front, Front Inner or Rear

SKF Differential Pinion Seal Overview

SKF Differential Pinion Seal 12456 is a rear axle sealing component built for manual transmission and driveline service where lubricant retention matters. It is specified with a 1.250 shaft diameter, 2.004 outside diameter, 0.250 width, and a nitrile sealing surface for dependable contact at the shaft interface.

Compatible with Ford Bronco and Ford F-350 applications listed below, this SKF seal supports rear axle service on vehicles that need a precise pinion seal replacement. The SKF 12456 part number is also referenced by Four Seasons 12456 for the same application.

Key Features

• SKF differential pinion seal for rear axle service
• Nitrile sealing surface type for lubricant control at the shaft
• 1.250 shaft diameter, 2.004 outside diameter, and 0.250 width
• Designed to help maintain proper sealing at the pinion area
• Direct-fit service part for select Ford Bronco and Ford F-350 applications
• Part number: 12456

Product Details

SKF has a long history in seal engineering, including early integrated shaft seal development and continued refinement of bonding methods and material selection. For this application, the seal is manufactured to specific design requirements using premium materials so it can match the demands of the operating environment. In rear axle service, that means helping keep gear lubricant in place while limiting contamination at the pinion seal area. The SKF 12456 is a practical replacement choice for Ford Bronco and Ford F-350 driveline maintenance, especially when addressing leaks at the differential pinion.

This part cross-references Four Seasons 12456 for the same application.

Common Problems This Seal Can Address

• Gear oil leaking from the rear axle pinion area
• Contamination entering the seal interface
• Worn or hardened nitrile sealing material
• Service issues caused by an aging differential pinion seal
• Loss of lubricant retention at the shaft opening

Installation Notes and Tips

Confirm shaft diameter, outside diameter, and seal width before installation. Inspect the pinion shaft surface for wear, scoring, or corrosion, since surface condition affects sealing performance. Clean the housing bore thoroughly and install the seal squarely to avoid distortion. Verify the application by year, make, model, and position before service.

• Fits 1966-1971 Ford Bronco, Front Inner, Thru Ser. K20000
• Fits 1953-1955 Ford F-350, Rear, Rockwell Std. B150 Axle

Quality Assurance

SKF manufactures seals to high quality standards with attention to material selection, fit, and durability. The brand’s seal engineering background supports consistent performance in drivetrain sealing applications.