Timken 470774 Automatic Transmission Extension Housing Seal
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Timken

Timken 470774 Automatic Transmission Extension Housing Seal

Brand Timken 470774
Fits Buick · 5 vehicles

Precision sealing design. Helps prevent lubricant escape and keep contaminants out.

Reinforced outer case. Helps resist installation damage and adds durability.

Contamination exclusion system. Helps block debris that can lead to leakage.

Cross-references Dorman - HELP 13585, National 470774 and Stant 13588 for the same application. See all 3.

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Timken 470774 Transmission Seal

Timken 470774 is an automatic transmission extension housing seal built for controlled fluid retention and contamination exclusion. It is a direct-fit service part for select Buick Dynaflow Flight-Pitch applications, including 1962-1964 Buick LeSabre and 1963-1964 Buick Riviera.

Key Features

  • Precision sealing design helps keep transmission lubricant inside the extension housing
  • Reinforced outer case resists installation damage and supports long-term durability
  • Ribbed rubber inner diameter seals minor spindle imperfections and promotes stable seating
  • Internal contamination exclusion system helps block debris that can lead to leakage
  • Vent holes allow lubricant flow around the seal lip to reduce heat buildup

Detailed Description

This Timken automatic transmission extension housing seal is engineered for service on classic Buick drivetrains where sealing integrity matters. The 470774 seal is used in 1962-1964 Buick LeSabre Dynaflow Flight-Pitch and 1963-1964 Buick Riviera Dynaflow Flight-Pitch applications, making it a relevant replacement for owners searching for a Timken 470774 transmission seal for Buick LeSabre or Buick Riviera. Timken’s seal construction focuses on keeping oil and grease contained while limiting the entry of harmful contaminants that can accelerate wear and leakage.

This part cross-references National 470774 for the same application.

Common Problems This Seal Can Address

  • Transmission fluid seepage at the extension housing
  • Contamination entering the seal area
  • Leakage caused by minor spindle surface imperfections
  • Heat buildup around the seal lip
  • Reduced sealing performance from worn or damaged original seals

Installation Notes and Tips

Inspect the extension housing and spindle surface before installation. Clean the sealing bore thoroughly, verify the seal seats evenly, and avoid nicking the outer case during installation. Confirm the vehicle application against the Dynaflow Flight-Pitch configuration before service.

Quality Assurance

Timken designs its oil and grease seals with reinforced construction and contamination control features to support dependable sealing performance in transmission service.

This part fits 5 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionPositionNotes
1964BuickLeSabreAutomaticN/ADynaflow Flight-Pitch
1964BuickRivieraAutomaticN/ADynaflow Flight-Pitch
1963BuickLeSabreAutomaticN/ADynaflow Flight-Pitch
1963BuickRivieraAutomaticN/ADynaflow Flight-Pitch
1962BuickLeSabreAutomaticN/ADynaflow Flight-Pitch
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Dorman - HELP — 13585National — 470774Stant — 13588