SKF 4938 Automatic Transmission Shift Shaft Seal

SKF 4938 Automatic Transmission Shift Shaft Seal

The SKF 4938 automatic transmission shift shaft seal is built for transmission sealing applications where shaft diameter, outside diameter, and sealing surface material must match precisely. It uses a nitrile sealing surface and is sized for a 0.500 shaft diameter, 0.879 outside diameter, and 0.250 width.

Key Features

• Part number: SKF 4938
• Automatic transmission shift shaft seal for transmission sealing systems
• Nitrile sealing surface for fluid control at the shaft interface
• 0.500 shaft diameter for specified transmission shaft applications
• 0.879 outside diameter and 0.250 width for dimensional match-up
• Cross-references Spicer 43075 for the same application

Detailed Description

SKF has a long history in seal engineering, and the 4938 reflects that focus with a design centered on material selection and dimensional accuracy. In transmission service, the seal helps retain lubricant at the shift shaft while limiting contamination entry, which is important for smooth operation and long-term sealing performance. For technicians sourcing a transmission shift shaft seal for Ford, Chevrolet, or Dodge applications, SKF 4938 provides a direct-fit style solution where the listed dimensions and sealing surface type are the critical match points.

This part cross-references Spicer 43075 for the same application.

What It Helps Address

• Transmission fluid seepage around the shift shaft
• Contamination entering the transmission through the shaft opening
• Seal wear from age, heat, and fluid exposure
• Leak diagnosis on automatic transmission shift linkage areas
• Replacement needs during transmission service or rebuild work

Installation Notes and Tips

Verify shaft diameter, outside diameter, and seal width before installation. Clean the bore and shaft surface thoroughly, inspect for scoring or corrosion, and install the seal squarely to avoid distortion. Confirm the transmission application against the vehicle service information for Ford, Chevrolet, or Dodge models before final assembly.

Quality Assurance

SKF manufactures seals to defined specifications using premium materials selected for the application and operating environment. The brand’s seal development history and manufacturing standards support consistent fit and sealing performance in transmission service.