SKF 21063 Transfer Case Output Shaft Seal - Rear

SKF 21063 Transfer Case Output Shaft Seal

SKF 21063 is a transfer case output shaft seal built for the rear output on select 1979 Ford trucks with New Process 203 transfer cases. It is sized for a 2.125-inch shaft diameter and uses a LongLife sealing surface to help maintain a tight seal at the transfer case output.

Key Features

• Transfer case output shaft seal for rear application
• Fits a 2.125-inch shaft diameter
• Outside diameter: 2.754 inches
• Width: 0.375 inch
• LongLife sealing surface type for durable sealing performance
• SKF part number 21063

Detailed Description

SKF 21063 is engineered as a precision sealing component for the transfer case output shaft, helping retain lubricant at the rear of the transfer case while keeping road debris and moisture out. SKF has a long history in shaft seal design, and this seal reflects that experience with premium materials and application-specific dimensions. It is a direct fit for 1979 Ford F-100, F-150, F-250, and F-350 rear transfer case applications using New Process 203 models. This part cross-references Ford D8TZ7B215E for the same application.

What It Helps Fix

• Transfer case fluid leaking from the rear output shaft area
• Lubricant loss around the output seal surface
• Contamination entering the transfer case through a worn seal
• Wet underbody or driveline residue near the rear of the transfer case
• Seal wear caused by age, heat, and normal driveline use

Installation Notes and Tips

Confirm the shaft diameter and transfer case model before installation. Inspect the output shaft surface for grooves, scoring, or corrosion that could affect sealing performance. Clean the sealing bore and surrounding area thoroughly, and verify the seal is seated squarely during installation. For best results, replace the seal when servicing a leaking transfer case output area on 1979 Ford F-100, F-150, F-250, or F-350 models with New Process 203 transfer cases.

Quality Assurance

SKF manufactures seals to specific designs using premium materials and controlled production standards. The 21063 is built to support long service life and dependable sealing performance in transfer case applications.