HD Cast Aluminum Rear Differential Cover with Raw Finish

Features:

• Fits 2001–2019 GM 2500HD/3500HD with 11.5" axle
• Heavy-duty cast aluminum construction
• Raw finish for rugged, industrial look
• Extra fluid capacity improves thermal performance
• Internal and external cooling fins
• Neodymium magnetic fill plug traps metal debris
• Helps extend differential service life
• Includes CMP-4000 high-performance gasket
• Stainless steel fasteners for corrosion resistance
• Designed and manufactured in the USA
• Direct fit for 14-bolt, 11.5" rear axles
• Supports heavy towing and off-road use

Built To Keep Your Rear End Running Strong

If you’re putting in serious miles or hauling heavy loads, upgrading your rear differential cover isn’t just a smart move, it’s a must. The PPE HD Cast Aluminum Rear Diff Cover gives your 2001-2019 Silverado or Sierra 2500HD/3500HD the cooling advantage it needs to go the distance. With its raw aluminum finish and aggressive fin design, this cover doesn’t just look tough, it’s built to handle extreme conditions where factory stamped steel covers fall short. It holds more fluid than stock, which means better temperature control when towing, climbing, or cruising long highway stretches. Inside and out, you’ll find cast-in cooling fins that help pull heat from the fluid and extend the life of your gears. PPE even includes a magnetic fill plug designed to grab and trap metal particles before they can do any damage. You also get stainless steel hardware and a high-performance gasket that make installation clean, quick, and reliable. Whether you're towing a fifth wheel or crawling through rocky trails, this cover gives your rear end the protection and peace of mind it deserves.

Engineered To Handle The Heat And The Load

PPE’s 138051000 rear differential cover is precision-engineered for GM 2500HD and 3500HD trucks built between 2001 and 2019, specifically those equipped with the 14-bolt 11.5-inch rear axle. This high-capacity cover is made from thick cast aluminum for superior strength and excellent heat dissipation under stress. Unlike thin factory covers, it features the industry's largest set of integrated cooling fins, both internally and externally, which work together to manage fluid temperatures during high-load conditions. The increased fluid volume offers thermal stability over longer distances, reducing the risk of overheating when towing or hauling heavy cargo. To further protect your differential, PPE includes a high-powered Neodymium magnetic fill plug that actively removes ferrous metal debris from the fluid. The included CMP-4000 gasket and stainless steel fasteners ensure a tight, leak-free seal that holds up over time. This cover is a direct bolt-on upgrade and requires no special modifications, making it an ideal choice for performance-minded truck owners looking to reinforce their drivetrain.

Fitment: 

• 2001-2019 GM 2500HD/3500HD trucks with 14 bolt - 11.5” rear axle
• 2003-2013 Dodge 2500HD/3500HD trucks with 14 bolt - 11.5” rear axle
• 2014-2016 Dodge 2500HD/3500HD trucks with leaf springs (will not fit trucks with coil springs)

Notes:

• Designed specifically for 2001-2019 GM 2500HD/3500HD 14-bolt 11.5" rear axles
• Also fits certain Dodge 2500HD/3500HD 14-bolt axles with leaf springs
• Will not fit 2014-2016 Dodge trucks equipped with coil springs
• Made from cast aluminum for strength and improved heat dissipation
• Includes internal and external cooling fins for better fluid cooling
• Provides extra fluid capacity compared to stock covers
• Comes with a magnetic fill plug to capture metallic debris in the fluid
• Supplied with a high-performance CMP-4000 gasket to help prevent leaks
• Includes stainless steel fasteners for corrosion resistance
• Cast aluminum finish is raw and may require finishing or painting for aesthetics
• Installation requires basic tools and moderate mechanical skill
• Cooling benefits are most noticeable under heavy towing or long-distance driving conditions