Pioneer Cables 758006 Automatic Transmission Clutch Piston Seal

Automatic Transmission Clutch Piston Seal for GM Applications

Pioneer Cables 758006 is an exact-fit replacement automatic transmission clutch piston seal for select GM vehicles. It is used at the intermediate clutch inner and outer positions in supported THM250C, THM350, THM350C, and related transmission applications.

Key Features

• Automatic transmission clutch piston seal for intermediate clutch inner/outer service
• Exact-fit replacement from Pioneer Transmission Components
• Built for select Chevrolet, GMC, Buick, Oldsmobile, Pontiac, and Cadillac applications
• Cross-references 3947088 and 6261079 for the same application
• Part number 758006 for catalog and fitment lookup

Detailed Description

This Pioneer Cables 758006 seal is a transmission sealing component used in intermediate clutch service on a wide range of rear-wheel-drive GM vehicles. It fits applications such as Chevrolet C10, Camaro, Nova, Monte Carlo, GMC Jimmy, Buick Regal, Oldsmobile Cutlass, and Pontiac Firebird across model years from 1969 through 1986, with notes that vary by transmission family. Pioneer Transmission Components are positioned as exact-fit replacement parts, making this seal a direct choice for transmission rebuild and repair work where proper sealing is critical.

For buyers searching by vehicle, this part is listed for Chevrolet C10, GMC C1500, and Pontiac Firebird applications, along with many other GM cars and trucks from the 1969-1986 range. Use part number 758006 when matching catalog listings or verifying interchange references.

What It Is Used For

• Replacing a worn or hardened intermediate clutch piston seal
• Addressing transmission fluid leakage at the clutch piston area
• Restoring hydraulic sealing in THM250C, THM350, and THM350C service
• Supporting transmission rebuilds on Chevrolet, GMC, Buick, Oldsmobile, Pontiac, and Cadillac models
• Correcting shift-quality issues tied to internal seal wear

Installation Notes and Tips

Verify the transmission code and the application notes before installation, especially on vehicles marked THM250C/M31, THM350, THM350C, or THM350C-only. Confirm the intermediate clutch inner/outer seal location during teardown and compare the old seal to the replacement before assembly. Clean sealing surfaces thoroughly and inspect related clutch components for wear before reassembly.

Quality Assurance

Pioneer Transmission Components are marketed as exact-fit replacement parts for transmission service, with application-specific fitment support for the listed GM vehicles and transmission types.