What Aftermarket Diff Cover Guys Don’t Tell You

Those who’ve followed Gale’s diff cover journey will find the latest video to be a great addition to the series. In the new episode, Gale takes a look inside the rear differential of our 2019 Ford F-250 while it’s on the lift, running at 70 mph! What happens inside the differential housing at highway speeds when using a high-capacity flat-back aftermarket diff cover is astounding.

00:00 Intro
00:22 Visual comparison
01:14 Making a clear diff cover
01:40 Analyzing fluid flow with factory fill
05:26 Analyzing fluid flow with overfill level
07:55 Dyno testing fluid temps
08:30 Lack of airflow
09:39 On-road testing
10:27 Test results
11:31 Ram-Air cover explained

Gale doing a side-by-side comparison of diff covers

We’re proud to introduce the latest in our family of patented Ram-Air differential covers. The new addition fits 1985-2020 Ford Sterling 12-bolt axles with 10.25/10.5 ring gear. Extensive steady-state dyno testing and on-road towing once again proved the Ram-Air cover outcools flatbacks by 5X. If you tow with your Ford, you owe it to yourself to take a look. Start by watching Gale’s video.

The Banks Ram-Air Diff Cover is also available for 2019+ Ram 2500/3500 vehicles and Chevy/GMC Vehicles. No matter what the make or model, our differential cover cools 5X better.