aFe 46-70402 Pro Series AAM 9.25 Front Diff Cover Black 4WD RAM 2500/3500 13-23

Vehicle Fitment

• 2013-2023 RAM 2500 (4WD, AAM 9.25-12 Bolt Front Axle, All Engines)
• 2013-2023 RAM 3500 (4WD, AAM 9.25-12 Bolt Front Axle, All Engines)

Fitment Notes

• This cover fits vehicles equipped with the AAM 9.25-inch 12-bolt front axle only. Always verify front axle type before ordering. 2WD trucks do not have a front differential and this cover will not apply.
• This is the FRONT differential cover only. The matching rear differential cover for 2013-2023 RAM 2500/3500 is aFe part number 46-70392 (AAM 11.5/11.8 rear axle).
• For a front and rear cover bundle including PRO Guard D2 synthetic gear oil, order aFe part number 46-70402-PL.
• Applies to all engine configurations on 2013-2023 RAM 2500/3500 equipped with 4WD, including L6-6.7L Cummins diesel, V8-5.7L HEMI, and V8-6.4L HEMI gas engines.

Features

• Increased oil capacity over the factory cover provides a larger lubricant reservoir and improved thermal buffer during towing, off-road use, and sustained heavy-duty operation.
• Built-in internal and external machined fins transfer heat from the differential fluid to the ambient airstream, significantly improving thermal management over the factory cover.
• Dual neodymium magnetic plugs - a magnetic drain plug and a deep-reach magnetic fill plug - continuously capture ferrous metallic wear particles to protect ring and pinion gears and bearings between service intervals.
• Pre-installed oil level sight glass with a calibration plug set to the factory fluid level, allowing quick visual inspection and eliminating the risk of accidental overfilling during fluid changes.
• Constructed from durable cast aluminum with reinforced ribbing for superior structural strength compared to the thin factory stamped steel cover.
• Wrinkle black powder coat finish with machined fins delivers a premium, aggressive appearance with long-term corrosion resistance and durability under harsh underbody conditions.
• All mounting hardware included for a complete, hassle-free installation using factory bolt holes - no drilling or modification required.
• Compatible with the factory front axle gasket for a leak-free seal at the differential housing mating surface.

Specifications

• Part Number: 46-70402
• Product Line: Pro Series
• Position: Front Differential Cover
• Axle Compatibility: AAM 9.25-Inch 12-Bolt Front Axle
• Cover Bolts: 12
• Material: Cast Aluminum with Reinforced Ribs
• Finish: Wrinkle Black Powder Coat with Machined Fins
• Magnetic Plugs: Dual Neodymium - Magnetic Drain Plug + Deep-Reach Magnetic Fill Plug
• Sight Glass: Pre-Installed Oil Level Sight Glass
• Calibration Plug: Pre-Set to Factory Fluid Level
• Oil Capacity: Increased over stock (exact volume varies by configuration)
• Hardware: All mounting hardware included
• Drivetrain: 4WD only
• MSRP: $442.50

Included Components

• 1x aFe Pro Series Front Differential Cover (Black w/ Machined Fins)
• 1x Dual Neodymium Magnetic Drain Plug
• 1x Deep-Reach Neodymium Magnetic Fill Plug
• 1x Pre-Installed Oil Level Sight Glass with Calibration Plug
• 1x Complete Mounting Hardware Kit

Product Description

The aFe POWER 46-70402 Pro Series Front Differential Cover is a precision-engineered drivetrain protection upgrade designed specifically for 2013-2023 RAM 2500 and RAM 3500 trucks equipped with 4WD and the AAM 9.25-inch 12-bolt front axle. The factory front differential cover on these trucks is a simple stamped steel unit with no thermal management capability, no fluid contamination protection, and no service-friendly features - a significant shortcoming on a platform that regularly operates under severe towing, hauling, and off-road loads where front axle temperatures can climb rapidly. The aFe Pro Series cover addresses all of these deficiencies with a single bolt-on upgrade that takes full advantage of the factory mounting locations.

At the core of the thermal improvement are the integrated internal and external machined fins that draw heat from the differential fluid through the cast aluminum body and dissipate it into the surrounding airstream - the same heat transfer principle used in performance oil coolers and engine components. The increased oil capacity over stock provides a greater thermal mass to absorb heat during sustained operation and a more consistent supply of lubricant to the ring and pinion gears and carrier bearings throughout the service interval. The dual neodymium magnetic plug system - combining a magnetic drain plug at the bottom and a deep-reach magnetic fill plug that extends further into the housing - captures ferrous metallic wear particles before they can recirculate through the differential's precision-clearance components.

The pre-installed oil level sight glass with its factory-height calibration plug removes the guesswork from fluid refills - simply fill until the correct level is indicated and stop, with no need to probe with a finger or measure with a dipstick. Installation is straightforward for any technician or experienced DIY mechanic, using all factory bolt locations with the included hardware kit. For RAM 2500 and 3500 owners who use their trucks for serious towing, off-road work, or fleet service, this front differential cover is a critical drivetrain investment - particularly when paired with the matching aFe rear differential cover (46-70392) for comprehensive front-to-rear axle protection.