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2016 ATS Premium 6-spd MT
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14,058 Posts
Speak of the devil, just drove about 700kms this weekend and noticed little oil spots all over the back of the car. I looked under Neath and seen a soaking wet rear diff and actually watched it drip. Greeaaat...
This is crazy. Something is causing this. It just HAS to be the vent.

If you eliminate the vent as the cause, you're left with a bad diff design, a poor prior repair job, or the use of poorly manufactured replacement seals ... all of which seem unlikely.

Someone needs to volunteer to remove their vent and leave a gaping hole to allow their diff to breathe and see if that fixes it. Anybody?
 
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2014 ATS 3.6 Premium RWD, 2016 Corvette Z06, 2018 GMC Sierra Denali 2500HD Diesel
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2,864 Posts
A barbed fitting in place of the rattle ball vent/valve connected to a short J shaped tube to prevent water from going in to the housing. The J shaped tube is available aftermarket and is used in many vent applications or you could make your own out of fuel or other petroleum safe rated hose of the proper ID to fit the barbed fitting you choose. Take the current vent with you to make sure you get the correct diameter and thread pitch screw in fitting.

Rodger
 
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