FAG SS3821 Manual Transmission Seal - Rear

Manual Transmission Seal for GM Applications

FAG SS3821 is a manual transmission seal built with a metal case, spring, and auxiliary lip to help maintain a stable seal at the transmission opening. It uses nitrile sealing material and precise dimensions for applications that require dependable fluid control and contamination resistance.

Key Features

• Part number SS3821 manual transmission seal
• Metal, spring, and auxiliary lip seal design
• Nitrile sealing material for transmission sealing service
• Bore diameter: 3.251 in. / 82.575 mm
• Seal outside diameter: 3.256 in. / 82.702 mm
• Seal width: 2.25 in. / 57.15 mm
• Engineered to help keep dirt, dust, and moisture out of the sealed area
• Helps retain grease and fluid at the bearing or seal interface

Detailed Description

FAG SS3821 is designed for transmission sealing applications where dimensional accuracy and material selection matter. The nitrile sealing element, supported by a metal shell and spring, is built to maintain contact pressure and help reduce leakage at the seal surface. With a 3.251-inch bore diameter, 3.256-inch outside diameter, and 2.25-inch width, this seal is specified for vehicles that require a precise OE-style fit. This part cross-references Timken 472636 for the same application. Compatible with 1998-2007 Chevrolet Silverado 1500, 1999-2007 Chevrolet Tahoe, and 1999-2007 GMC Sierra 1500 applications, FAG SS3821 is also listed across multiple Cadillac, Chevrolet, and GMC truck and SUV platforms.

Vehicle Fitment

• Fits 2002-2007 Cadillac Escalade, N/A
• Fits 1999-2000 Cadillac Escalade, N/A
• Fits 2007 Chevrolet Avalanche, N/A
• Fits 1999-2007 Chevrolet Silverado 1500, N/A
• Fits 2001-2007 Chevrolet Suburban 1500, N/A
• Fits 2003-2007 Chevrolet Suburban 2500, N/A
• Fits 1999-2007 Chevrolet Tahoe, N/A
• Fits 1999-2007 GMC Sierra 1500, N/A
• Fits 2000-2007 GMC Yukon, N/A
• Fits 2002-2006 Chevrolet Avalanche 1500, N/A
• Fits 2002-2006 Chevrolet Avalanche 2500, N/A
• Fits 1998-2005 Chevrolet Blazer, N/A
• Fits 1998-2005 GMC Jimmy, N/A
• Fits 1998-2004 Chevrolet S10, N/A
• Fits 2001-2002 Chevrolet Silverado 1500 HD, N/A
• Fits 2001-2002 GMC Sierra 1500 HD, N/A
• Fits 1998-2002 GMC Sonoma, N/A
• Fits 2000-2002 GMC Yukon XL 1500, N/A
• Fits 2000 Chevrolet Suburban 1500, N/A
• Fits 1999 Chevrolet K1500, N/A
• Fits 1999 Chevrolet K1500 Suburban, N/A
• Fits 1999 GMC K1500, N/A
• Fits 1999 GMC K1500 Suburban, N/A

What It Helps Address

• Transmission fluid seepage at the seal surface
• Contamination from dirt, dust, and moisture
• Loss of grease or lubricant at the bearing interface
• Wear-related sealing issues in high-mileage GM truck and SUV drivetrains
• Replacement needs during transmission service or rebuild work

Installation Notes and Tips

Verify bore diameter, outside diameter, and seal width before installation to confirm the correct match for the application. Inspect the shaft or housing surface for scoring, corrosion, or debris before fitting the new seal. Clean the sealing area thoroughly and install the seal squarely to avoid distortion or premature wear. For best results, follow the vehicle service procedure for the specific Cadillac, Chevrolet, or GMC application.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The seal construction and material selection are intended to support consistent sealing performance in demanding wheel-end and drivetrain environments.