Differential gear oil in action

[patkelly4370]

Gale Banks of Banks Turbo fame shows what's going on inside your differential(s) when you drive.
What's going on behind your stock diff cover? - YouTube

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[Shiftless Joe]

Those large square finned aftermarket diff covers a lot of Chevy guys run are doing more harm than good.

 

[rdruss]

Yep, what's happening is what's happening, not going to improve or disrupt what's going on inside the 4Runner diff unless overfill or underfill.