FAG SS3786 Transfer Case Input Shaft Seal

Transfer Case Input Shaft Seal for Classic 4x4s

The FAG SS3786 transfer case input shaft seal is built for applications that need a precise sealing surface and dependable protection against contamination. With a metal and spring seal design and nitrile sealing material, it helps maintain lubricant retention at the transfer case input shaft while keeping dirt, dust, and moisture out.

Compatible with a wide range of classic Jeep, Chevrolet, GMC, and Ford 4x4 applications, including 1969-1980 Chevrolet Blazer, 1975-1980 Chevrolet K20, and 1976-1979 Ford Bronco, this seal is a direct-fit service part for many transfer case sealing repairs. The FAG SS3786 is also cross-referenced to Davico Mfg 19236 for the same application.

Key Features

• Part number: SS3786
• Transfer case input shaft seal for sealing system service
• Seal type: metal with spring
• Sealing material: nitrile
• Bore diameter: 2.686 in. / 68.224 mm
• Seal outside diameter: 2.69 in. / 68.326 mm
• Seal width: 1.938 in. / 7.722 mm
• Fits many Jeep, Chevrolet, GMC, and Ford 4x4 platforms

Detailed Description

FAG SS3786 is a transfer case input shaft seal engineered to match demanding vehicle sealing requirements. The nitrile sealing lip and spring-loaded metal construction are selected to help maintain contact at the shaft surface, supporting lubricant retention and reducing contamination at the transfer case. This matters on older 4x4 drivetrains where wear, age, and exposure can affect sealing performance.

Fitment includes 1980-1986 Jeep CJ7, 1981-1985 Jeep Scrambler, 1980-1983 Jeep CJ5, 1977-1981 Chevrolet K30, 1979-1981 GMC K2500, 1979-1981 GMC K3500, 1975-1980 Chevrolet K10, 1969-1980 Chevrolet K10 Suburban, 1975-1980 Chevrolet K20, 1969-1980 Chevrolet K20 Suburban, 1975-1980 Chevrolet K5 Blazer, 1970-1980 GMC Jimmy, 1979-1980 GMC K1500, 1979-1980 GMC K1500 Suburban, 1979-1980 GMC K2500 Suburban, 1976-1979 Ford Bronco, 1976-1979 Ford F-100, 1975-1979 Ford F-150, 1973-1979 Ford F-250, 1973-1979 Ford F-350, and 1969-1974 Chevrolet Blazer. Search terms such as Jeep CJ7 transfer case input shaft seal, Ford Bronco transfer case seal, and Chevrolet K20 transfer case seal all point to this application family.

This part number, SS3786, also appears in interchange listings for Schaeffler Global Number 413 3786 100.

Common Repair Uses

• Stops gear oil seepage at the transfer case input shaft
• Addresses contamination from dirt, dust, and moisture entering the transfer case
• Helps restore sealing on worn or aging 4x4 driveline components
• Supports repair of leaks found during transfer case service
• Helps maintain proper lubricant level in classic Jeep, Chevrolet, GMC, and Ford applications

Installation Notes and Tips

Confirm bore diameter, outside diameter, and seal width before installation to ensure the seal matches the transfer case housing and shaft dimensions. Inspect the input shaft surface for grooves, corrosion, or scoring before pressing in the new seal, since shaft damage can shorten seal life. Clean the sealing area thoroughly and install the seal squarely to avoid distortion of the nitrile lip and spring assembly.

For best results, verify the vehicle application by year, make, and model before ordering. This is especially important on older 4x4 platforms such as Jeep CJ5, Jeep CJ7, Chevrolet K5 Blazer, and Ford F-150 where drivetrain configurations can vary by build.

Quality Assurance

FAG designs sealing components to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS3786 is built for demanding sealing service in transfer case applications where contamination control and lubricant retention are critical.