ATP HO-9 Automatic Transmission Extension Housing Seal

The ATP HO-9 is an automatic transmission extension housing seal designed as an exact-fit, no-compromise replacement for the original part. This seal prevents transmission fluid leaks at the extension housing — a common source of drivetrain fluid loss on high-mileage vehicles. It measures 1.75 inches inside diameter, 2.6875 inches outside diameter, and 0.5 inches thick.

Key Features:

• Inside Diameter: 1.75 in.
• Outside Diameter: 2.6875 in.
• Thickness: 0.50 in.
• Exact-fit replacement — no modification required

ATP Transmission Seals and Gaskets are engineered to meet original equipment specifications for a reliable, long-lasting repair. This seal fits a wide range of domestic and import applications spanning model years 1951–2008, with strong coverage for Chevrolet, GMC, Ford, Pontiac, Buick, Mercury, Oldsmobile, Jeep, Cadillac, and American Motors vehicles, among others.