InMotion WS470774 Automatic Transmission Extension Housing Seal

Automatic transmission seal for classic Buick and Cadillac applications

InMotion WS470774 is an automatic transmission extension housing seal built for specific vintage Buick and Cadillac applications with GMC DynaFlow or GMC Flight-Pitch transmission setups. It provides a tight sealing surface to help keep contaminants out and fluid where it belongs.

Key features

• Precision-fit seal for automatic transmission extension housing service
• Inside diameter: 1.375 in.; shaft diameter: 1.375 in.
• Outside diameter: 2.066 in.; housing bore: 2.062 in.
• Built from high-quality materials for sealing consistency
• Compatible with select Buick and Cadillac models from 1946-1960

Detailed description

This InMotion transmission seal is specified for a wide range of classic Buick and Cadillac vehicles, including Buick Electra, LeSabre, Roadmaster, Special, Super, Century, Skylark, Estate Wagon, Invicta, and Cadillac DeVille, Series 60 Fleetwood, Series 62, and Series 75 Fleetwood. Fitment includes applications with GMC DynaFlow Transmission and GMC Flight-Pitch Transmission, making WS470774 a targeted replacement for restoration and drivetrain service work. The part number WS470774 is useful when matching the correct seal to the original transmission housing dimensions and application notes.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common issues this seal can address

• Transmission fluid seepage at the extension housing
• Contamination entering the sealed housing area
• Wear-related sealing loss from age and heat cycling
• Incorrect seal sizing during restoration or repair
• Service concerns on original DynaFlow and Flight-Pitch applications

Installation notes and quality

Verify the transmission type and housing dimensions before installation. Match the seal to the listed fitment and confirm the inside diameter, outside diameter, shaft diameter, and housing bore against the original component. Professional installation is recommended for classic drivetrain service. InMotion WS470774 is engineered with precision and made from high-quality materials for reliable sealing performance.