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2022 2500HD High Country
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1,615 Posts
Hmmm, I didn't know there was a filter behind the diff's flange seal!!!!! </sarcasm>

All kidding aside, I'm assuming that's the rear diff. Clearly wet at the flange, yet getting drier as it seeps backwards, due to air flow pulling the diff oil towards the rear of the vehicle.

Time to find a new mechanic, that's for sure!!!
 

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2007 GMC Sierra LBZ
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2,479 Posts
”Leaky oil filter”? That person is NOT a mechanic. Looks like its time for a new pinion seal.
 
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