PPE 2017-2026 Ford Super Duty Dana M300 14-Bolt Heavy-Duty Cast Aluminum Rear Differential Cover

Built to Handle the Load. Engineered to Manage Heat.

When your Ford Super Duty is working hard, your rear differential is working right alongside it. Towing heavy trailers, hauling equipment, and putting in long highway miles can generate significant heat inside the differential housing.

The PPE Heavy-Duty Cast Aluminum Rear Differential Cover is engineered to give your Dana M300 axle more than just an appearance upgrade. With increased fluid capacity, improved heat-dissipating features, and heavy-duty aluminum construction, this cover is designed to support drivetrain durability under demanding conditions.

Designed for 2017–2026 Ford Super Duty trucks equipped with the Dana M300 14-bolt rear axle, this is a functional upgrade for owners who expect more from their trucks.

Why Upgrade Your Factory Differential Cover?

As differential gears operate, friction and fluid movement generate heat. Under sustained loads, elevated temperatures can reduce the protective properties of differential fluid and place additional stress on internal components.

PPE addresses these challenges with a purpose-built design that combines additional fluid capacity, external cooling fins, internal windage scrapers, and reinforced cast-aluminum construction.

The result is an upgraded differential cover engineered to improve heat management, reduce unnecessary fluid churning, and provide additional housing rigidity.

Features & Benefits

• 0.8 Quart Additional Fluid Capacity: Increases differential oil capacity over the factory cover, providing greater thermal capacity during demanding operation.
• A356.0-T6 Heat-Treated Cast Aluminum: Premium aluminum construction delivers strength, rigidity, and effective heat-transfer properties.
• Half-Inch External Cooling Fins: Increase exterior surface area to help dissipate heat while adding structural strength and impact resistance.
• Internal Windage Scrapers: Precision-positioned internal features help reduce unnecessary fluid churning, aeration, heat generation, and parasitic losses.
• Reinforced Cross-Bracing Design: Internal scrapers and external fins work together to create a rigid structure for improved strength.
• Cast-In Reinforcement Gussets: Provide additional support around the differential housing flange.
• Magnetic Stainless-Steel Service Plugs: High-temperature neodymium magnets help collect ferrous metallic particles from the differential fluid.
• Viton O-Ring Seals: Provide durable sealing at the service plugs.
• Factory-Level Fill Position: The fill plug is positioned to correspond with the factory differential fluid level.

Designed for Towing, Hauling & Heavy-Duty Use

Your rear differential transfers torque to the wheels while supporting the demands of your Super Duty's drivetrain. When pulling heavy trailers or carrying substantial loads, managing differential fluid temperature becomes especially important.

PPE's increased fluid capacity and heat-dissipating aluminum design help address these demands. The internal windage scrapers are also engineered to reduce unnecessary fluid agitation, contributing to more efficient fluid management inside the housing.

Whether your truck is a dedicated workhorse, daily driver, or tow rig, the PPE differential cover combines functional engineering with a distinctive heavy-duty appearance.

Available Finish Options

Select the finish that best complements your truck:

• Raw Aluminum: Natural cast-aluminum appearance for a clean, industrial look.
• Brushed Aluminum: Refined metallic appearance that highlights the cover's finned design.
• Black: Dark finish for an understated, performance-oriented appearance.

Note: Finish selection does not change the core differential cover design or technical features.

Vehicle Fitment

2017–2026 Ford Super Duty

Designed for vehicles equipped with the Dana M300 14-bolt rear differential, commonly found in applicable Ford Super Duty dual-rear-wheel configurations.

Critical Fitment Note: Ford Super Duty trucks can be equipped with different rear axle models, including the Dana M275, M300, and M315.

These axles have visually similar differential covers, and all may use 14 mounting bolts. However, the covers are not interchangeable.

You must verify that your truck is equipped with the Dana M300 rear axle before ordering. Do not determine compatibility by model year, truck model, or bolt count alone.

If you're unsure which axle your truck has, contact Diesel Proof before placing your order.

Installation & Service Considerations

• Axle Verification: Confirm Dana M300 compatibility before beginning installation.
• Differential Fluid: Use the correct fluid type and specification required for your specific vehicle and axle.
• Fluid Capacity: The cover adds approximately 0.8 quart of capacity compared with the factory cover. Follow the appropriate fluid-level procedure rather than assuming a fixed refill amount.
• Sealing & Installation: Follow PPE's installation instructions for the correct sealing method, hardware, and torque specifications.
• Service Plugs: The magnetic fill and drain plugs allow inspection and removal of collected metallic particles during future service.

Why Choose PPE?

Pacific Performance Engineering designs performance-focused drivetrain components that combine practical engineering with heavy-duty construction.

From the material selection and reinforced casting to the cooling fins and magnetic service plugs, this differential cover is engineered to deliver meaningful functional improvements over a basic factory-style cover.

More fluid capacity. Better heat-management features. Heavy-duty construction.

Built For Your Truck.

Questions about Dana M300 fitment or selecting the right differential cover? Contact Diesel Proof. We're here to help you get the right parts for your build.