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Thread Sealer on Actuator to Front Differential?


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Quick question that I searched found no discussion....

I'm cleaning and flushing all systems on my '07 NBS Sierra including the front driveline and in doing so I removed the plastic actuator unit from the the differential (see photo).  It appeared to have a white dope on the threads similar in consistency and color to home plumbing pipe thread paste.  After cleaning and before re-installing  what should I apply on those threads?   Anyone have any clue what the OEM call-out is on that item?   I'm a maintenance mechanic by trade so I understand basic sealing processes but I'm curious as to what if anything others have used in this area and what GM does at the factory - can find nothing online.  Thanks in advance!

32271883-5C2E-4C28-8774-0D59F7BA0814.jpeg

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