Key Features

Die-Cast Aluminum Construction

A380 aircraft aluminum die-cast for exceptional strength and precise fit.

Magnetic Fill Plug

Magnetic fill plug. 20° angle for easy fill. Simplifies oil changes.

304 Stainless Steel Hardware

Hex flanged mounting bolts.

Sight-Glass with Contrast Screen

Sight-glass with contrast screen and Viton O-ring seal.

Class-Leading Heat Rejection

24 external radiator fins offer 694.2 extra square inches of surface area to ensure optimal heat rejection.

Magnetic Drain Plug

Recessed magnetic drain plug. Simplifies oil changes.

Patented Ram-Air Scoops

Ram-Air system directs cool high-velocity air through radiator fins, eliminating the dead zone. Designed with breakaway scoops.

NPT Sensor Port

1/8in NPT port for transmission temp monitoring.

Key Features

Image showing a smooth radiused internal surface

Radiused Ports

Radiused ports for smoother fluid flow.

Directional Fluid Guides

Axle-tube guides direct fluid to axle bearings without churn.

O-Ring Seal

Integrated No Mess Viton Seal. Dry-mount silicon high-pressure O-ring seal. No messy RTV required.

Graphic highlighting covers machined surface

Precision Fit Machined Surface

CNC-machined surface ensures precise fit.

Animation showing internal fins obsorbing heat

Internal Heat Absorption Fins

Internal absorber fins offer 120 square inches of surface area to transfer heat to external radiator fins without disrupting fluid flow.

Simple Fluid Change

No need to remove cover to change fluid.

Lubricant Raceway

Ring gear raceway provides path for fluid flow to pinion and ring gear-bearing sets.

Ram-Air System w/Breakaway Scoops

Ram-Air scoop break away point prevents damage if scoop is snagged.

Purpose Built

The Banks Engineering team’s goal was to perfect fluid flow and reject BTUs from the fluid as fast as the ring and pinion puts them in. If the fluid flow is impeded in any way, it results in resistance and aeration which reduce fuel economy and creates heat, thereby degrading the fluid and decreasing the lifespan of the gearset.

The Superior Choice, Backed by 18 Months of Testing

What began with a simple question, resulted in millions of video views, innovation, and another patented Banks product.

All other manufacturers simply copied previous designs. They all run on the belief that "more oil means cooler temps."

The Banks Engineering Team uncovered two underlying problems with aftermarket covers; poor air flow and flawed fluid dynamics. The Banks Ram-Air® differential cover solves both issues.

And your oil even cooler

Tests were performed on a stretch of California’s infamous Grapevine (Interstate 5) on the same truck, with the same driver and the same load, at the same time of day and same temperature

After testing covers with flat-backs and those with larger fluid capacities, it was apparent that these covers do not cool as well as advertised, suffer from poor fluid dynamics, and they all make no use of airflow to cool actively.

Banks Recommends Amsoil Lubricant

We searched for information on every popular brand of gear oil. The only company with in-depth knowledge and the willingness to share it was AMSOIL.

They are every bit as thorough in their development as we are. The more info we discovered, the more we liked how AMSOIL designs and test their products. If you want to see for yourself, here is a link to their 75w90 test results.

Ram-Air<sup>®</sup> Differential Cover Kit

3 Image composite of the Black-Ops, Machined, and Natrual Aluminum Ram-Air Diff Covers For Sterling 12 Bolt

Ram-Air^® Differential Cover Kit

Name: Ram-Air ® Differential Cover Kit
Brand: Banks Power
SKU: 19258
Price: 395.0 USD
Availability: InStock

Patented design cools 5X better than flat-backs

For 1985-2022 Ford Sterling Axle 12-bolt with 10.25/10.5 ring gear

In stock, ready to ship!

$482.78

$375.00

Choose Your Ram-Air^® Differential Cover Kit

$395.00

Black Ops

$395.00

Satin Black/Machined

$375.00

Natural Aluminum

Add Ons

No add-ons selected

Amsoil 75w90 First Fill 4-Qt Easy Pack

+$88.36

Amsoil 75w140 First Fill 4-Qt Easy Pack

+$96.76

Free Shipping on orders over $100 (48 Contiguous US)*

Fitment Alert: Will Not Fit With Rear Sway Bar

Banks Ram-Air^® differential cover extends lubrication life and retains fuel economy. Thanks to its superior fluid and aerodynamics, the Ram-Air^® Cover out-performs stock and flat-back high-capacity covers and does so with less lubricant. Increased distance between service intervals and less lubricant means you'll save money while extending gear life.

CARB E.O. Not Required

Fitment Alert: Will Not Fit With Rear Sway Bar

Click to confirm fitment with this guide

Specifications

When it comes to product development, we only make products that increase performance and beat the competition. So when we tested the popular Diff Covers on the market, we were shocked to find out that they actually hurt performance. This lead to the development of something so New and Incredible that our performance design has a United States Patent.

Look, when we set out to build a product for your vehicle, we only engineer the best. What else would you expect from a company with a winning legacy that spans decades. We are here to win, and we just did (AGAIN) in a huge way

Key Features

Key Highlights

New patented design features Ram-Air scoops for fastest cooling
- Provides cold high velocity air, overcoming “dead air zone” behind differential
- Scoops force air up and into massive heat radiation fins
- Engineered to break-away if snagged on an obstacle
Banks cools 5X better than flat-back covers in on-road towing tests over the same road, same weather, operator and vehicle
Cools 118% better than flat-backs in 200hp 60mph sustained tests
Dry-mount high-pressure silicone O-ring seal. No messy RTV clean!
Internal fins transfer heat through the cover into the external fins
Clears spare tire heat shield, Panhard bars and other components
Does not sacrifice any ground clearance
Limited Lifetime Warranty

Fluid Dynamics

Axle tube lubricant guides directs lube to bearings w/o overfilling
Cover mates flush with differential housing for smooth fluid flow
Ring gear raceway controls fluid flow to the pinion and bearings
Low fluid aeration means longer fluid life

Technical Specs

Weight: 11.7 lbs
External heat radiation fin count: 23
Internal heat absorption fin count: 22
Dimensions: 13.3 in X 12.8 in X 3.5 in
External heat radiation fin surface area: 694.2 in2
Internal heat absorption fin surface area: 103.1 in2
External heat radiation total surface area: 741.9 in2
Internal heat absorption total surface area: 222.2 in2
Fasteners: 12 x stainless steel 5/16 flange hex bolts
Material: A380 aluminum diecast with CNC machined surfaces
Internal Volume: About 3.3-3.6 Qts (Check OEM Owners Manual)

Oil service

Magnetic drain plug
Magnetic fill port plug
20° angled fill port for easy access
No need to remove cover to change fluid
1/2 in sight glass with contrast screen (visual aid) and Viton seal
Banks recommends Amsoil 75W-90 Severe Gear Synthetic Gear Lube
Fill level depends on model year: (About 4.0Qts Fill To OEM Level)

Manuals

Ram-Air Differential Cover Install Guide - Sterling 12-Bolt

Questions? Contact Support

California Prop 65 Warning

Introducing the Banks Power Ram-Air® Diff Cover Kit

Patented design cools 5X better than flat-backs

Key Features

Die-Cast Aluminum Construction

Magnetic Fill Plug

304 Stainless Steel Hardware

Sight-Glass with Contrast Screen

Class-Leading Heat Rejection

Magnetic Drain Plug

Patented Ram-Air Scoops

NPT Sensor Port

Key Features

Radiused Ports

Directional Fluid Guides

O-Ring Seal

Precision Fit Machined Surface

Internal Heat Absorption Fins

Simple Fluid Change

Lubricant Raceway

Ram-Air System w/Breakaway Scoops

Purpose Built

Outperform The Competition, For Less

Flat-Back Fail

Banks Does It Right

Flat-Backs Dead Air

Ram-Air Engineering

Heat Radiation Comparison

Heat Absorption Comparison

The Superior Choice, Backed by 18 Months of Testing

Keeps Your Diff Cool

And your oil even cooler

Banks Recommends Amsoil Lubricant

Maintains OE Fill Level

Ground Clearance

Fitment Check

Ram-Air® Differential Cover Kit

For 1985-2022 Ford Sterling Axle 12-bolt with 10.25/10.5 ring gear

$375.00

Choose Your Ram-Air® Differential Cover Kit

Add Ons

CARB E.O. Not Required

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Ram-Air^® Differential Cover Kit

Choose Your Ram-Air^® Differential Cover Kit