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SKF 21379 Differential Pinion Seal - RearOE Quality 60-Day Returns
Part #: 21379

SKF 21379 Differential Pinion Seal - Rear

Rear
20 vehicles fit this part
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Fitment: Chevrolet, GMC, and Ford, P30, P3500, F-500, P-500, P-400, M-450, and M-400
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SKF Differential Pinion Seal for Rear Axles

The SKF 21379 differential pinion seal is built for rear axle service where pinion sealing accuracy matters. With a 2.125 shaft diameter, 3.628 outside diameter, and 0.469 width, this seal is sized for specific driveline applications that need reliable lubricant retention and contamination control.

SKF has a long history in seal engineering, and this part reflects that focus with a polyacrylate sealing surface type selected for demanding driveline environments. If you need an SKF differential pinion seal 21379 for Chevrolet P30 or GMC P3500 rear axle service, this part is built to match the application details listed below.

Key Features

  • Part number: 21379
  • Differential pinion seal for rear axle use
  • Width: 0.469
  • Outside diameter: 3.628
  • Shaft diameter: 2.125
  • Polyacrylate sealing surface type
  • Engineered to keep gear lubricant in and road contaminants out

Fitment Details

  • Fits 1982-1991 Chevrolet P30, rear. Notes: Fits differential pinion seal for 12.00" ring gear without MHC.
  • Fits 1982-1991 GMC P3500, rear. Notes: Fits differential pinion seal for 12.00" ring gear without MHC.

What This Seal Helps Address

  • Gear oil seepage at the differential pinion area
  • Contamination entering the axle housing through a worn seal
  • Noise or driveline wear related to low lubricant level
  • Leak-related maintenance on Chevrolet P30 rear axle assemblies
  • Leak-related maintenance on GMC P3500 rear axle assemblies

Installation Notes and Tips

Confirm the shaft diameter, outside diameter, and seal width before installation. Inspect the pinion yoke and sealing surface for wear, scoring, or corrosion, since surface condition affects seal performance. Clean the housing bore thoroughly and install the seal squarely to avoid distortion. This SKF 21379 seal cross-references A1205S1527 and 172286 for the same application.

Quality Assurance

SKF designs and manufactures seals to specific application requirements using premium materials and controlled bonding methods. The brand’s seal engineering background supports long service life and dependable sealing performance in driveline applications.

This part fits 20 vehicles. Search below:

YearMakeModelPositionNotes
1991ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1991GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1990ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1990GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1989ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1989GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1988ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1988GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1987ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1987GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1986ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1986GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1985ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1985GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1984ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1984GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1983ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1983GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.
1982ChevroletP30RearFits differential pinion seal for 12.00" ring gear without MHC.
1982GMCP3500RearFits differential pinion seal for 12.00" ring gear without MHC.

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.