GM GENUINE PARTS Differential Pinion Gear Seal 26064028 — OEM replacement, leak-resistant

When a pinion seal wears or fails it can let gear oil escape, leading to messy leaks and potential drivetrain damage. The GM Genuine Parts 26064028 pinion gear seal is engineered and validated by GM to match the original equipment specifications for compatible Chevrolet, Buick, GMC and Cadillac differentials. It’s intended to restore the proper sealing surface between the drive pinion and the differential housing so fluid stays where it belongs.

How does this pinion gear seal stop differential leaks?

The seal provides a tight barrier around the rotating pinion shaft to keep gear lubricant inside the differential while excluding dirt and moisture. Its lip geometry and sealing materials are selected to maintain contact under typical axle loads and rotational speeds without compromising service life.

• Precisely matched dimensions to original equipment fitment for reliable sealing.
• Durable elastomer lip resists extrusion and wear from shaft rotation.
• Constructed to exclude contaminants that accelerate leakage and bearing wear.

What vehicles and situations is part 26064028 appropriate for?

Part number 26064028 is a GM Genuine Parts item intended as a direct replacement in GM differentials that specify this OEM number. It’s suitable whenever the original pinion seal is worn, leaking, or replaced during differential or pinion service.

• Direct OE replacement for GM applications that list 26064028.
• Recommended during differential rebuilds, pinion bearing replacement, or when leaks are observed.
• Useful for both preventive maintenance and repair after seal failure.

How do I install or inspect the GM pinion gear seal correctly?

Installation requires removing the pinion yoke and old seal, checking mating surfaces and bearings, then pressing the new seal squarely into the bore to the proper depth. Inspect the pinion shaft for grooves or damage and replace any worn bearings to ensure the new seal performs as designed.

• Press-in installation; avoid hammering the sealing lip or distorting the bore.
• Check pinion shaft finish and bearing preload before sealing.
• Use correct GM torque specs and alignment procedures for reassembly.

What materials and quality controls does GM use for this seal?

GM Genuine Parts are engineered and tested to match or exceed the standards used in vehicle production. The 26064028 seal uses materials and dimensions approved by GM engineers and is produced under controlled manufacturing processes to ensure consistent performance.

• Manufactured to GM dimensional and material specifications for repeatability.
• Tested to resist common degradation from heat, oil, and shaft movement.
• Backed by GM’s validation and traceability for service parts.

Who is this for: The GM Genuine Parts 26064028 pinion gear seal is for owners, technicians, and fleet managers who need an OEM-fit replacement to stop differential leaks and restore factory sealing performance. It suits anyone servicing compatible Chevrolet, Buick, GMC or Cadillac rear or front differentials where this OEM part number is specified, including professional shops performing differential rebuilds and do-it-yourselfers replacing a worn pinion seal.