SKF 18998 Manual Transmission Seal Kit - Rear

Manual Transmission Seal Kit for Rear Applications

SKF 18998 is a manual transmission seal kit built for rear-position service on a wide range of Chevrolet, GMC, Pontiac, and classic GM performance models. It is specified with a 1.886 shaft diameter, 2.704 outside diameter, and a 1.000 width, with a polyacrylate sealing surface type for the application.

SKF has a long history in shaft seal design, and this part reflects that experience with premium materials and application-specific construction for dependable sealing performance in transmission service.

Key Features

• Part number 18998 manual transmission seal kit
• Rear-position seal for manual transmission service
• 1.886 shaft diameter, 2.704 outside diameter, 1.000 width
• Polyacrylate sealing surface type
• Application-specific design for GM truck and performance vehicle fitments
• Cross-reference part numbers: 145818998, 975918998

Detailed Description

SKF 18998 is engineered for rear manual transmission sealing where correct dimensions and sealing material are critical. The listed fitments include Chevrolet K1500, K2500, K3500, K5 Blazer, Tahoe, Camaro, Corvette, Nova, El Camino, Monte Carlo, and Pontiac Firebird, GTO, LeMans, and Grand Am applications, along with multiple GMC K-series and V-series trucks and SUVs. This part number 18998 is also used across New Process 208, 241C, and 243C transfer case-related applications and Muncie transmission fitments where specified in the vehicle notes.

SKF manufactures seals to specific designs using premium materials so the seal matches the operating environment and helps maintain lubricant retention while keeping contaminants out. For buyers searching for a rear manual transmission seal kit for 1981-1999 Chevrolet and GMC trucks or 1969-1975 GM performance cars, SKF 18998 is a direct-fit service part for the listed applications.

What It Helps Address

• Transmission fluid seepage at the rear seal area
• Contamination entering the transmission through a worn seal
• Leak-related low lubricant levels
• Seal wear from age, heat, and mileage
• Service replacement during transmission or transfer case maintenance

Installation Notes and Tips

Verify the shaft diameter, outside diameter, and width before installation to confirm the seal matches the transmission or transfer case housing. Review the vehicle notes carefully, especially the required bushing size and transmission designation such as New Process 208, 241C, 243C, or Muncie. Clean the sealing surface and inspect the shaft for wear or scoring before installing SKF 18998.

Quality Assurance

SKF designs and manufactures seals to high quality standards using application-specific materials and construction. The brand’s seal engineering heritage dates back to the first integrated shaft seal, and its products are built for long service life in demanding drivetrain environments.