A pinion differential seal is a small but crucial component that prevents gear oil from leaking out of your vehicle's differential housing. A faulty seal can lead to low oil levels, damaging the gears and bearings. Selecting the correct seal ensures proper lubrication and extends the life of your drivetrain.
- Spicer genuine OE replacement
- Genuine Spicer differential pinion seal
- American motors AMX 1970-68, concord 1983-78, eagle 1987-80, hornet 1977-70, javelin 1974-68, matador 1978-71, pacer 1980-75; ford Aerostar 1997-90, explorer 2013-91, ranger 2005-90; hummer h1 2006-02; jeep Cherokee 2001-84; more
- Included components: Pinion Oil Seal
- Provides the performance you expect from ACDelco
- Product type :AUTO PART
- Package dimensions :2.794 cm L x10.922 cm W x11.176 cm H
- country of origin :Taiwan
- Package Dimensions: 2.0 cms (L) x 8.4 cms (W) x 13.0 cms (H)
- Product Type: Auto Part
- Package Quantity: 1
- Country Of Origin: United States
- Differential pinion seal fits a GM 8. 5 inch 10-bolt pinion
- The package length is 9.398 centimeters
- The package height is 0.533 centimeters
- The package width is 11.684 centimeters
- Helps ensure differential fluid does not leak out of your vehicle's differential
- Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
- GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
- GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
- GM regularly updates production and service part designs to integrate new materials and technologies
- Product Type :Auto Part
- Package Dimensions :9.398 Cm L X9.144 Cm W X1.777 Cm H
- Country Of Origin :China
- Package Weight :1.99Lbs
- This National Differential Pinion Seal is compatible with Ford F-150 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999 (Rear
- Genuine National Parts
- Includes original packaging and hardware
- Direct replacement auto parts
- Confirm vehicle fitment with Amazon Confirmed Fit
- Differential pinion seal fits a standard Ford 9 inch pinion using 28-spline axles
- The package length is 9.398 centimeters
- The package height is 0.762 centimeters
- The package width is 12.7 centimeters
- This National Differential Pinion Seal is compatible with Ford F-250 Super Duty 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999
- Genuine National Parts
- Includes original packaging and hardware
- Direct replacement auto parts
- Confirm vehicle fitment with Amazon Confirmed Fit
- Compatible with wide range of fluids
- Package Dimensions: 0.75 H x 4.0 L x 4.0 W (inches)
- Package Weight: 0.16 pounds
- Country of Origin : Taiwan
This article is part of our complete guide Automotive — browse all our comparisons and buying guides.
Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Pinion Differential Seals
Understanding Pinion Seals
The pinion seal is a rubber or composite ring that fits around the pinion shaft where it enters the differential housing. Its primary function is to keep the differential fluid contained while preventing contaminants from entering. These seals are subject to constant rotation, heat, and pressure, making them wear out over time.
Key Factors to Consider
- Vehicle Compatibility: The most critical factor is ensuring the seal matches your specific vehicle's make, model, year, and drivetrain configuration (e.g., 2WD vs. 4WD, axle type).
- Material: Seals are typically made from rubber (nitrile) or more durable materials like Viton. Nitrile is common and cost-effective, while Viton offers better resistance to heat and chemicals, making it suitable for heavy-duty applications.
- Size and Dimensions: The seal's inner diameter, outer diameter, and width must precisely match the pinion shaft and housing bore. Incorrect dimensions will result in leaks.
- Brand Reputation: Opt for reputable brands known for quality automotive parts. Established manufacturers often provide more reliable and longer-lasting seals.
Installation Considerations
Replacing a pinion seal requires specialized tools and knowledge of differential assembly. It typically involves removing the driveshaft, pinion nut, and pinion shaft. Proper installation is vital; a damaged seal during installation or incorrect torque specifications can lead to immediate failure. If you are not experienced, it is highly recommended to have a professional mechanic perform the replacement.
When to Replace
Signs of a failing pinion seal include visible oil leaks around the differential housing or driveshaft, a burning smell (due to oil hitting hot exhaust components), and a low differential fluid level. Regular inspections during routine maintenance can help identify issues before they become severe.