SKF 21236 Automatic Transmission Seal - Rear

SKF Automatic Transmission Seal for Heavy-Duty GM Applications

SKF 21236 is an automatic transmission seal built for rear-position use on select Chevrolet and GMC heavy-duty trucks and vans. It is specified with a Vamac sealing surface and precise dimensions to support a proper seal at the shaft and housing interface.

Key Features

• Automatic transmission seal for rear applications
• Vamac sealing surface type for durable sealing performance
• Width: 0.552 in.
• Outside diameter: 2.885 in.
• Shaft diameter: 2.125 in.
• SKF part number 21236

Fitment Details

• Fits 1999 Chevrolet P30, rear, w/ 15,000 lb GVW
• Fits 1992-1997 Chevrolet P30, rear, w/ 15,000 lb GVW
• Fits 1992-1997 Chevrolet C3500, rear, w/ 15,000 lb GVW
• Fits 1992-1997 Chevrolet K3500, rear, w/ 15,000 lb GVW
• Fits 1992-1997 GMC C3500, rear, w/ 15,000 lb GVW
• Fits 1992-1997 GMC K3500, rear, w/ 15,000 lb GVW
• Fits 1992-1997 GMC P3500, rear, w/ 15,000 lb GVW

Detailed Description

SKF 21236 is engineered for rear automatic transmission sealing on Chevrolet P30, Chevrolet C3500, Chevrolet K3500, GMC C3500, GMC K3500, and GMC P3500 applications with 15,000 lb GVW ratings. The seal’s 2.125-inch shaft diameter, 2.885-inch outside diameter, and 0.552-inch width help ensure the correct fit at the transmission interface, while the Vamac sealing surface is selected for sealing performance in demanding drivetrain environments. SKF has a long history of seal design and manufacturing, and this part reflects that focus on dimensional accuracy and material selection. This part cross-references 8675731 for the same application.

Common Repair Uses

• Transmission fluid leakage at the rear seal area
• Contamination entering the transmission through a worn seal
• Seal wear from age, heat, or mileage
• Drivetrain service on heavy-duty GM trucks and vans
• Replacement during transmission rebuild or reseal work

Installation Notes and Tips

Verify shaft diameter, outside diameter, and width before installation to confirm the seal matches the transmission case and shaft dimensions. Inspect the sealing surface and surrounding components for wear, scoring, or contamination before installing SKF 21236. Clean the sealing area thoroughly and follow the vehicle service procedure for rear transmission seal replacement on the applicable Chevrolet or GMC model.

Quality Assurance

SKF manufactures seals to defined specifications using premium materials and controlled production standards. The brand’s seal engineering background supports consistent fit and long service life in transmission applications.