HSP Diesel 2001-2019 Chevy/gmc Duramax 2003-2018 Dodge Ram Cummins Aam 11.5" Rear Differential Cover
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Colours and prices as published by HSP Diesel · verified 9/8/2026
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HSP Diesel AAM 11.5 Inch Rear Differential Cover for 2001-2019 Chevy/GMC Duramax and 2003-2018 Dodge/Ram Cummins
The HSP Diesel AAM 11.5 Inch Rear Differential Cover is built for 2001-2019 Chevrolet / GMC Duramax trucks and 2003-2018 Dodge/Ram Cummins trucks equipped with the AAM 11.5 inch rear differential.
Designed as a direct factory replacement, this rear differential cover replaces select factory GM and Mopar differential covers while adding strength, durability, and a clean custom look to the rear end of your truck.
What Is the HSP Diesel AAM 11.5 Inch Rear Differential Cover?
The HSP Diesel AAM 11.5 Inch Rear Differential Cover is a heavy-duty replacement for the factory rear differential cover. Built from laser-cut, bent, and welded materials, this cover is designed to provide a stronger, more refined solution than the factory cover.
With its custom look and powder coat options, the HSP Diesel rear differential cover is a great way to clean up the rear of the truck while matching or contrasting the rest of your build.
Factory Replacement Cross-Reference
This rear differential cover is designed to replace the following factory part numbers:
• GM Part Numbers: 12471445, 20984339, 23445891
• Mopar Part Numbers: 5086904AD, 5086904AB, 5086904AC
Features
• Fits AAM 11.5 inch rear differentials only
• Direct replacement for select factory GM and Mopar rear differential covers
• Laser-cut, bent, and welded construction
• Increased strength compared to the factory-style cover
• Custom powder coat options available
• Cleans up the rear end with a bold, custom look
• Includes 1/2 inch drain plug
• Made for 2001-2019 Chevy/GMC Duramax and 2003-2018 Dodge/Ram Cummins applications
What’s Included?
• (1) 2001-2019 GM / 2003-2018 Dodge rear differential cover - HSP-IN-060
• (1) 1/2 inch drain plug - RFB-511-RFAB
Vehicle Fitment
• LB7: 2001-Early 2004 Chevrolet / GMC 6.6L Duramax - VIN Code 1
• LLY: 2004.5-2006 Chevrolet / GMC 6.6L Duramax - VIN Code 2
• LBZ: 2006-2007 Chevrolet / GMC 6.6L Duramax - VIN Code D
• LMM: 2007.5-2010 Chevrolet / GMC 6.6L Duramax - VIN Code 6
• LML: 2011-2016 Chevrolet / GMC 6.6L Duramax - VIN Code 8
• L5P: 2017-2019 Chevrolet / GMC 6.6L Duramax - VIN Code Y
• 5.9L Cummins: 2003-2004 Dodge Ram - VIN Code 6 or C
• 5.9L Cummins: 2005-2007 Dodge Ram - VIN Code C
• 6.7L Cummins: 2007.5-2008 Dodge Ram - VIN Code A
• 6.7L Cummins: 2009-2018 Dodge/Ram - VIN Code L
Special Note
This differential cover fits AAM 11.5 inch rear differentials only . If you are unsure of your fitment, use the OEM part numbers listed above as a cross-reference before ordering.
Our Warranty
HSP No BS Limited Lifetime Warranty
At HSP, we believe in our products and stand firmly behind every part that leaves our facility. We have always supported our customers, and the HSP No BS Limited Lifetime Warranty makes that commitment official.
For complete information about warranty coverage, policies, exclusions, and the claims process, review the full warranty details using the link below.
View the HSP No BS Limited Lifetime Warranty
HSP Diesel AAM 11.5 Inch Rear Differential Cover for 2001-2019 Chevy/GMC Duramax and 2003-2018 Dodge/Ram Cummins
The HSP Diesel AAM 11.5 Inch Rear Differential Cover is built for 2001-2019 Chevrolet / GMC Duramax trucks and 2003-2018 Dodge/Ram Cummins trucks equipped with the AAM 11.5 inch rear differential.
Designed as a direct factory replacement, this rear differential cover replaces select factory GM and Mopar differential covers while adding strength, durability, and a clean custom look to the rear end of your truck.
What Is the HSP Diesel AAM 11.5 Inch Rear Differential Cover?
The HSP Diesel AAM 11.5 Inch Rear Differential Cover is a heavy-duty replacement for the factory rear differential cover. Built from laser-cut, bent, and welded materials, this cover is designed to provide a stronger, more refined solution than the factory cover.
With its custom look and powder coat options, the HSP Diesel rear differential cover is a great way to clean up the rear of the truck while matching or contrasting the rest of your build.
Factory Replacement Cross-Reference
This rear differential cover is designed to replace the following factory part numbers:
• GM Part Numbers: 12471445, 20984339, 23445891
• Mopar Part Numbers: 5086904AD, 5086904AB, 5086904AC
Features
• Fits AAM 11.5 inch rear differentials only
• Direct replacement for select factory GM and Mopar rear differential covers
• Laser-cut, bent, and welded construction
• Increased strength compared to the factory-style cover
• Custom powder coat options available
• Cleans up the rear end with a bold, custom look
• Includes 1/2 inch drain plug
• Made for 2001-2019 Chevy/GMC Duramax and 2003-2018 Dodge/Ram Cummins applications
What’s Included?
• (1) 2001-2019 GM / 2003-2018 Dodge rear differential cover - HSP-IN-060
• (1) 1/2 inch drain plug - RFB-511-RFAB
Vehicle Fitment
• LB7: 2001-Early 2004 Chevrolet / GMC 6.6L Duramax - VIN Code 1
• LLY: 2004.5-2006 Chevrolet / GMC 6.6L Duramax - VIN Code 2
• LBZ: 2006-2007 Chevrolet / GMC 6.6L Duramax - VIN Code D
• LMM: 2007.5-2010 Chevrolet / GMC 6.6L Duramax - VIN Code 6
• LML: 2011-2016 Chevrolet / GMC 6.6L Duramax - VIN Code 8
• L5P: 2017-2019 Chevrolet / GMC 6.6L Duramax - VIN Code Y
• 5.9L Cummins: 2003-2004 Dodge Ram - VIN Code 6 or C
• 5.9L Cummins: 2005-2007 Dodge Ram - VIN Code C
• 6.7L Cummins: 2007.5-2008 Dodge Ram - VIN Code A
• 6.7L Cummins: 2009-2018 Dodge/Ram - VIN Code L
Special Note
This differential cover fits AAM 11.5 inch rear differentials only . If you are unsure of your fitment, use the OEM part numbers listed above as a cross-reference before ordering.
Our Warranty
HSP No BS Limited Lifetime Warranty
At HSP, we believe in our products and stand firmly behind every part that leaves our facility. We have always supported our customers, and the HSP No BS Limited Lifetime Warranty makes that commitment official.
For complete information about warranty coverage, policies, exclusions, and the claims process, review the full warranty details using the link below.
View the HSP No BS Limited Lifetime Warranty
HSP offers a limited lifetime warranty to the original purchaser on eligible HSP products. Underhood powder coating has separate two-year limited coverage. Non-HSP brands follow their own manufacturer warranties. Discontinued products and customer/installer damage are excluded. Claim authorization is required; customer pays inbound shipping for ordinary claims.
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
HSP Diesel warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Professional installation is recommended.
- Return eligibility
- HSP states returns must be postmarked within 30 days of purchase, new and unused with original tags and packaging, with an approved RMA. A 15% restocking fee and customer-paid return shipping apply. Special orders, non-HSP dropship products, apparel, used items and custom colors are excluded. Based on what HSP Diesel offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- HSP Diesel
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- HSP Diesel
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.