How does the calibration plug work?

The 1/8" NPT calibration plug is set to the factory fluid level. This eliminates accidental overfilling, which can cause foaming and reduced lubrication.

What kind of maintenance does this differential cover require?

The magnetic drain plug should be inspected and cleaned periodically to remove any accumulated metallic debris. Refer to your vehicle's service manual for recommended gear oil change intervals.

Does this cover come with a gasket?

No, this differential cover does not include a gasket. You may need to purchase a new gasket or sealant separately to ensure a leak-free installation. Refer to the manufacturer's installation instructions for details.

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aFe

Specifications

Brand: aFe
Part #: 46-70370

aFe

aFe POWER Differential Cover GM Trucks 99-13

Name: aFe POWER Differential Cover GM Trucks 99-13
Brand: aFe
SKU: afe-afe-power-differential-cover-gm-trucks-99-13-t14-894935
Price: 344.65 USD
Availability: BackOrder

$344.65

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

This aFe differential cover adds extra protection and cooling to your GM truck's rear end.

Key Features

A356-T6 cast aluminum — strong and lightweight
Reinforcing ribs — adds extra strength
External fins — cools fluid
Magnetic drain plug — captures loose particles
Magnetic fill plug — captures loose particles
Calibration plug — prevents overfilling

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will it fit your car?

About this part

Product Details

aFe Power's new rear differential cover brings performance engineering to the protection of your axle's differential. This differential cover is constructed out of durable A356-T6 cast aluminum with reinforcing ribs for maximum strength. Mounting hardware is included for a hassle-free installation. A calibration plug set to the factory level prevents overfilling of the differential. A magnetic drain plug and a deep reach magnetic fill plug are provided for maximum protection. This cover has a raw finish with machined fins for a distinctive look. 4 Quart Gear Oil Capacity: This cover has about a 4 quart gear oil capacity at the factory fill level, factory cover holds about 3 quarts. Built-in External Fins: Built-in external fins transfer heat from the fluid to the outside air for maximum cooling. Magnetic Drain/Fill Plug: This system incorporates a magnetic drain and deep reach fill plug that captures loose particles for maximum rear-end protection. Oil Level calibration plug: A 1/8" NPT calibration plug is set to the factory fluid level which eliminates accidental overfilling. When it comes to engineering for power, performance, protection and value, aFe Power is the only choice.