Do rear diff covers really work or are they just bling? In part 2 of 3, Gale Banks explains the test methods, why it's taken so long, and takes a look at a few aftermarket covers.

See the culmination of more than 18 months of research and development.

Is your differential cover KILLING your gears?
   • Is your differential cover KILLING yo...  

Watch the full "Behind the Diff Cover" video series here:
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