ATP Parts SO-36 Automatic Transmission Detent Cable Seal

Automatic Transmission Detent Cable Seal for GM Applications

ATP Parts SO-36 is an automatic transmission detent cable seal built to match the original fit and sealing dimensions used on a wide range of GM vehicles. With an inside diameter of 0.375 in., thickness of 0.4375 in., and outside diameter of 0.625 in., this seal is sized for the detent control cable top hat boot location and related O-ring applications.

Use ATP SO-36 when servicing a leaking or worn detent cable seal on Chevrolet, GMC, Buick, Oldsmobile, Pontiac, and Cadillac models from 1978-1986. This ATP Parts transmission seal is an exact-fit replacement for the listed applications, including Chevrolet C10, GMC C1500, and Chevrolet K5 Blazer fitments.

Key Features

• Automatic transmission detent cable seal for GM rear-wheel-drive and truck applications
• Inside diameter: 0.375 in.
• Thickness: 0.4375 in.
• Outside diameter: 0.625 in.
• Direct replacement for the detent control cable top hat boot sealing point
• Cross-reference part numbers include 13580A and 760011

Detailed Description

ATP Parts SO-36 is part of ATP Transmission Seals and Gaskets, a line focused on exact-fit replacement sealing components. This seal is used at the transmission detent control cable area to help maintain a proper seal where the cable passes through the transmission case or related boot assembly. It is listed for a broad range of 1978-1986 GM passenger cars, vans, and trucks, including Chevrolet C10, Chevrolet C20, GMC C2500, and Pontiac Parisienne applications.

This part number, SO-36, also appears in interchange listings with aftermarket references such as 13580A and Pioneer Automotive Industries 760011, making it easier to match the correct seal during transmission service. For vehicles with THM250C/M31, THM350, or THM350C notes, verify the transmission code before installation.

What This Part Helps Address

• Transmission fluid seepage at the detent cable seal area
• Worn or hardened seal material around the cable boot
• Improper sealing after transmission service or cable replacement
• Leak concerns on Chevrolet and GMC truck applications
• Seal replacement needs on classic GM passenger cars and vans

Installation Notes and Tips

Confirm the transmission type and application notes before ordering, especially on models with THM250C/M31, THM350, or THM350C callouts. Inspect the detent cable, boot, and sealing surface for wear, corrosion, or distortion before installing the new seal. Clean the mating area thoroughly so the seal seats evenly and maintains proper contact.

Fits 1986 Chevrolet C10, seal - detent control cable - top hat boot; 1982-1984 Chevrolet C10, seal - detent control cable - top hat boot; 1986 GMC C1500, seal - detent control cable - top hat boot; 1982-1984 GMC C1500, seal - detent control cable - top hat boot; 1986 Chevrolet K5 Blazer, seal - detent control cable - top hat boot; and many additional listed GM applications from 1978-1986.

Quality Assurance

ATP Parts positions SO-36 as an exact-fit replacement seal for the listed transmission applications. The part is built to match the specified dimensions and application requirements for GM detent cable sealing service.