What aftermarket diff cover guys don't tell you!

Aftermarket rear differential covers have been around for decades. But what effect do they have on your gear oil? What's really going on behind the cover? Gale Banks compares popular high-capacity flat-back units with the new patented Ram-Air rear diff cover for Ford Sterling axles. The new Ram-Air rear differential cover fits the 1985-2020 Ford Sterling Axle 12-bolt with 10.25/10.5 ring gear and is available with Amsoil SEVERE GEAR® Synthetic Extreme Pressure Gear Lube. https://www.bankspower.com/diffcovers Available for: 2001-2019 Chevy/GMC and 2003-2018 RAM with AAM 11.5" or 11.8" 14-bolt rear axle 1985-2022 Ford Sterling Axle 12-bolt with 10.25"/10.5" ring gear 2017+ Ford F250 HD tow pkg and F350 SRW with Dana M275 axle 2019+ RAM 2500/3500, 2020+ GM 2500/3500 with 14-bolt AAM axle, 11.5", 12" ring gear Watch the full "Behind the Diff Cover" video series.    • Differential Cover Development   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 Protected by AMSOIL, the leader in synthetics. https://www.amsoil.com #differentialcover #diffcover #engineering