SKF 12905 Differential Pinion Seal - Rear

SKF 12905 Differential Pinion Seal for Pontiac Rear Axles

The SKF 12905 differential pinion seal is built for rear axle sealing on select Pontiac applications, including 1961-1962 Pontiac Tempest and 1963 Pontiac LeMans. It is designed to retain gear lubricant at the pinion while helping keep dirt and moisture out of the driveline.

• Polyacrylate sealing surface for durable sealing performance
• Outside diameter: 2.004 in.
• Shaft diameter: 1.301 in.
• Width: 0.438 in.
• OE-style differential pinion seal for rear axle service

Sealing Design and Application

SKF 12905 uses a polyacrylate sealing surface selected for the demands of driveline sealing. SKF has a long history in seal engineering, and this part reflects that focus with precise dimensions for the pinion area. For rear differential service on Pontiac Tempest and Pontiac LeMans models, the seal helps maintain lubricant control at the pinion shaft interface.

This part cross-references 947-480M1 and 18642A for the same application.

What This Seal Helps Address

• Gear oil seepage at the differential pinion area
• Contamination entering the rear axle housing
• Seal wear from age, heat, and driveline movement
• Noise or driveline issues related to low lubricant level
• Service replacement for worn rear pinion seals

Installation Notes

Verify shaft diameter, outside diameter, and width before installation to confirm proper seating in the housing. Inspect the pinion yoke surface for grooves or damage, since seal performance depends on a smooth sealing surface. Clean the housing bore and surrounding area thoroughly before installing the new seal on the rear axle.

Quality Assurance

SKF designs and manufactures seals to specific application requirements using premium materials and controlled production standards. The brand’s seal engineering heritage dates back to the first integrated shaft seal, and its products are built for long service life in demanding automotive environments.