Product Description
Mopar 5086905AA AAM 11.5/11.8 Differential Cover Gasket for 2003-2020 Dodge Ram 5.9L & 6.7L Cummins
The Mopar 5086905AA Differential Cover Gasket is a genuine OEM replacement gasket designed for Dodge Ram trucks equipped with AAM 11.5-inch and 11.8-inch rear differentials. Engineered to factory specifications, this gasket provides a reliable seal between the differential housing and cover, helping prevent gear oil leaks while maintaining proper lubrication and protection for critical drivetrain components.
Whether you're performing routine differential maintenance, replacing a leaking gasket, or servicing your rear axle during a gear oil change, the Mopar 5086905AA gasket delivers OEM fitment and long-lasting sealing performance. Manufactured to meet Mopar quality standards, it helps ensure proper differential operation under towing, hauling, daily driving, and performance applications.
Using a genuine Mopar gasket helps eliminate sealing concerns often associated with universal gasket materials and provides the confidence of an OEM-engineered repair.
Features
- Genuine Mopar OEM differential cover gasket
- Designed for AAM 11.5-inch and 11.8-inch rear axles
- Direct replacement for factory gasket
- Helps prevent differential fluid leaks
- Maintains proper axle lubrication and protection
- Precision-cut for OEM fitment
- Ideal for differential service and fluid changes
- Durable construction for long service life
- Designed for towing, hauling, and heavy-duty use
- Meets Mopar factory quality standards
Fitment
- 2003 Dodge Ram 2500 5.9L Cummins with AAM 11.5 Rear Axle
- 2003 Dodge Ram 3500 5.9L Cummins with AAM 11.5 Rear Axle
- 2004-2007 Dodge Ram 2500 5.9L Cummins with AAM 11.5 Rear Axle
- 2004-2007 Dodge Ram 3500 5.9L Cummins with AAM 11.5 Rear Axle
- 2007.5-2020 Ram 2500 6.7L Cummins with AAM 11.5 or 11.8 Rear Axle
- 2007.5-2020 Ram 3500 6.7L Cummins with AAM 11.5 or 11.8 Rear Axle
Note: Verify axle type before ordering. This gasket is intended for AAM 11.5-inch and 11.8-inch rear differential applications.
What's Included
- Mopar 5086905AA Differential Cover Gasket
Specifications
- Manufacturer: Mopar
- Part Number: 5086905AA
- Product Type: Differential Cover Gasket
- Axle Compatibility: AAM 11.5 and AAM 11.8 Rear Differentials
- Installation Location: Rear Differential Cover
- Vehicle Compatibility: Dodge Ram and Ram Heavy Duty Trucks
- Engine Compatibility: 5.9L Cummins and 6.7L Cummins
- Function: Seals Differential Cover to Axle Housing
- Replacement Type: Direct OEM Replacement
- Condition: New
- Application: Differential Service and Maintenance
Cross Reference Numbers
5086905AA, Mopar 5086905AA, AAM 11.5 Differential Gasket, AAM 11.8 Differential Gasket, Ram 2500 Differential Cover Gasket, Ram 3500 Differential Cover Gasket
FAQ
What differential does the Mopar 5086905AA fit?
This gasket is designed for AAM 11.5-inch and AAM 11.8-inch rear differential applications commonly found in Dodge Ram and Ram heavy-duty trucks.
Is this a genuine Mopar part?
Yes. The 5086905AA is a genuine Mopar OEM differential cover gasket manufactured to factory specifications.
When should I replace my differential cover gasket?
The gasket should be replaced whenever the differential cover is removed for service or if fluid leaks are present around the cover sealing surface.
Will this fit both 5.9L and 6.7L Cummins trucks?
Yes. This gasket is commonly used on Cummins-equipped Ram trucks utilizing the AAM 11.5 or 11.8 rear differential assemblies.
Can I reuse my old differential gasket?
It is generally recommended to install a new gasket whenever the differential cover is removed to help ensure a proper leak-free seal.
Why use a genuine Mopar gasket?
Genuine Mopar gaskets are engineered to match factory sealing specifications, ensuring proper fitment, durability, and long-term reliability.
