ATP Parts CO-24 Automatic Transmission Oil Pump Seal - Front, Front Outer or Outer

Automatic Transmission Oil Pump Seal for GM Applications

ATP Parts CO-24 is an automatic transmission oil pump seal built as an exact-fit replacement for a wide range of GM rear-wheel-drive and front-wheel-drive applications. It is sized for the specified pump seal dimensions and supports service work on vehicles such as the Chevrolet C1500, GMC Jimmy, and Cadillac DeVille.

Key Features

• Automatic transmission oil pump seal from ATP Parts
• Exact-fit replacement part for transmission sealing service
• Inside diameter: 1.6875 in.
• Outside diameter: 2.875 in.
• Thickness: 0.375 in.
• Fits front and front outer positions where listed
• Cross-references Anchor 3227 for the same application

Product Details

ATP Transmission Seals and Gaskets are made as direct replacement sealing components for transmission repair. The CO-24 oil pump seal is used to help maintain proper fluid sealing at the transmission pump area, which is critical during rebuilds, reseals, and leak correction. This part number, CO-24, is listed across many 1988-1993 GM platforms, including Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac models. Common fitment examples include 1993 Chevrolet C1500 Front Outer, 1993 GMC Yukon Front Outer, and 1991-1993 Cadillac DeVille Front.

Compatible vehicle coverage includes 1993 Buick Roadmaster, 1993 Chevrolet Astro, 1993 Chevrolet Blazer, 1993 GMC Safari, and 1993 Oldsmobile Bravada, along with additional applications listed for 1988-1993 Chevrolet Camaro, Corvette, S10, and related GM trucks and vans. The CO-24 part number is also referenced by several aftermarket numbers, making it easier to match during transmission service.

What This Part Helps Address

• Transmission fluid seepage at the oil pump seal area
• Seal wear found during transmission rebuilds
• Leak repair on high-mileage GM automatic transmissions
• Replacement of a hardened, flattened, or damaged pump seal
• Service work on GM 4L60-E, THM700-R4/4L60/MD8 applications where noted

Installation Notes and Tips

Verify the transmission code, position, and notes before installation. Some listed vehicles use front outer or front positions, and certain Cadillac and Chevrolet applications specify 4L60-E or THM700-R4/4L60/MD8 compatibility. Inspect the pump bore and sealing surface for wear, clean all mating surfaces thoroughly, and confirm the seal dimensions match the original part before assembly. For best results, install during a full transmission service or rebuild when access to the pump area is available.

Quality Assurance

ATP Parts CO-24 is part of ATP’s transmission sealing line, which is positioned as an exact-fit replacement solution for repair professionals and do-it-yourself transmission service.