National 470380V Automatic Transmission Output Shaft Seal
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National 470380V Automatic Transmission Output Shaft Seal

Brand National 470380V
Housing Bore (Inch) 2.375
Housing Bore (MM) 60.330
Inside Diameter 1.500
Inside Diameter 38.100
Material Fluoro-Elastomer
Outside Diameter 2.378
Outside Diameter 60.400
Outside Diameter (Inch) 2.378
Outside Diameter (mm) 60.400
Part Description Oil Seal
Redicoat Yes
Series 470000
Shaft (Inch) 1.500
Shaft (MM) 38.100
Thickness 0.312
Thickness 7.920
Type 47
Unit of Dimension Inch
Width (Inch) 0.312
Width (mm) 7.920
Fits Cadillac, Oldsmobile, and GMC · 25 vehicles

Fluoro-elastomer seal. Resists heat and wear for dependable sealing performance.

Redicoat finish. Helps the seal install smoothly and seat securely.

Oil seal design. Built to keep transmission fluid contained where it belongs.

Cross-references Four Seasons 14992, Four Seasons 14994 and National 470380V for the same application. See all 6.

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Automatic Transmission Output Shaft Seal for Cadillac and Oldsmobile

The National 470380V is an automatic transmission output shaft seal built for specific Cadillac Eldorado and Oldsmobile Toronado applications with the GMC THM425 transmission. It uses fluoro-elastomer material and Redicoat treatment to support sealing performance in demanding transmission environments.

  • Automatic transmission output shaft seal for transmission sealing service
  • Fluoro-elastomer construction for fluid resistance
  • Redicoat finish for improved sealing surface characteristics
  • 1.500 in. shaft / inside diameter, 2.378 in. outside diameter
  • 0.312 in. width and 2.375 in. housing bore specification
  • National 470380V / Series 470000 oil seal design

Fitment and Application Details

Fits 1967-1978 Cadillac Eldorado, N/A, with GMC THM425 Transmission. Fits 1966-1978 Oldsmobile Toronado, N/A, with GMC THM425 Transmission. The National 470380V is also cross-referenced to Four Seasons 14992 and 14994 for the same application.

For buyers searching for a Cadillac Eldorado transmission output shaft seal or an Oldsmobile Toronado THM425 oil seal, this part number provides a direct replacement path. The 470380V is specified for 1.500-inch shafts and a 60.330 mm housing bore, making it a precise service part for the listed driveline setup.

What This Seal Helps Address

  • Transmission fluid seepage at the output shaft area
  • Seal wear from age, heat, and fluid exposure
  • Loss of sealing integrity around the shaft and housing bore
  • Service replacement needs on THM425-equipped Cadillac Eldorado and Oldsmobile Toronado models

Installation Notes and Tips

Verify shaft diameter, housing bore, and transmission type before installation. Clean the bore and shaft sealing surface thoroughly, and inspect for scoring or wear that could affect seal performance. Match the seal orientation to the transmission assembly during installation, and confirm the part number 470380V against the vehicle’s THM425 configuration before final assembly.

Quality Assurance

National has supplied sealing products for more than 75 years and continues to develop sealing solutions for modern vehicle service needs. The 470380V reflects that focus with a transmission-specific oil seal design for the listed Cadillac and Oldsmobile applications.

This part fits 25 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionPositionNotes
1978CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1978OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1977CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1977OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1976CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1976OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1975CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1975OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1974CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1974OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1973CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1973OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1972CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1972OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1971CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1971OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1970CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1970OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1969CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1969OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1968CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1968OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1967CadillacEldoradoAutomaticN/AViton Type; with GMC THM425 Transmission
1967OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
1966OldsmobileToronadoAutomaticN/AViton Type; with GMC THM425 Transmission
Directly replaces or cross-references 6 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 14992Four Seasons — 14994National — 470380V2725647464397470