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2018 Yukon XL Denali Transmission Maint Question.


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So I thought the 10-speed transmission was a sealed system, so I would have to syphon the tranny fluid from the fill port, but crawling under I see this screw.  When I google 24288491, the Pan part number, I can’t tell if this screw is the drain plug or not.  Does anyone know?  

AFE216DE-3E70-47D9-9833-65FA334CE96F.jpeg

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