Product Description
MOPAR 5086905AA AAM 11.5/11.8 DIFFERENTIAL COVER GASKET FOR 03-20 DODGE RAM WITH 5.9L/6.7L CUMMINS ENGINE
Restore a proper rear differential seal with the genuine Mopar 5086905AA Differential Cover Gasket designed for AAM 11.5 and 11.8 rear axles found in 2003-2020 Dodge Ram and Ram HD trucks equipped with the legendary 5.9L and 6.7L Cummins diesel engines.
This OEM Mopar gasket is engineered to provide a leak-free seal between the differential housing and cover, helping protect internal gears and bearings from fluid loss and contamination. Manufactured to factory specifications, the 5086905AA gasket ensures proper fitment, long-term durability, and dependable sealing performance under towing, hauling, and heavy-duty driving conditions.
Whether you are replacing a leaking gasket during routine differential service or installing an upgraded differential cover, this genuine Mopar gasket helps maintain proper axle lubrication and differential reliability.
Frequently Asked Questions (FAQ)
Is this a genuine Mopar gasket?
Yes — Mopar 5086905AA is a genuine OEM differential cover gasket manufactured to factory specifications.
What axle does this gasket fit?
This gasket fits AAM 11.5 and AAM 11.8 rear differentials commonly found in Ram 2500 and Ram 3500 trucks.
Will this fit both 5.9L and 6.7L Cummins trucks?
Yes — this gasket fits many 2003-2020 Ram HD diesel applications equipped with 5.9L or 6.7L Cummins engines.
Can this gasket be reused?
Mopar recommends replacing the differential cover gasket anytime the cover is removed to ensure a proper seal.
Does this help prevent gear oil leaks?
Yes — this OEM gasket is designed to maintain a secure seal and help prevent differential fluid leaks.
Fitment Details
- 2003-2020 Dodge Ram 2500 with 5.9L/6.7L Cummins diesel engine
- 2003-2020 Ram 2500 with 5.9L/6.7L Cummins diesel engine
- 2003-2020 Dodge Ram 3500 with 5.9L/6.7L Cummins diesel engine
- 2003-2020 Ram 3500 with 5.9L/6.7L Cummins diesel engine
- Fits AAM 11.5 and AAM 11.8 rear differential applications
- Verify axle application prior to ordering
Specifications for Mopar 5086905AA
| Category | Details |
|---|---|
| Part Number | 5086905AA |
| Brand | Mopar (OEM) |
| Product Type | Differential Cover Gasket |
| Axle Compatibility | AAM 11.5 / AAM 11.8 Rear Differential |
| Engine Compatibility | 5.9L Cummins / 6.7L Cummins Diesel |
| Vehicle Fitment | 2003-2020 Ram 2500 / 3500 |
| Material | OEM Composite Sealing Material |
| Installation Location | Rear Differential Cover |
| Fitment Type | Direct OEM Replacement |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping | Ships via standard ground service |
| Country of Origin | United States |
| Prop 65 | No Prop 65 Warning Reported |
| Condition | New |
