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I have a 2009 Chevy Silverado 1500 four-wheel-drive. Front differential fill plug is seized and won’t budge. I’ve sprayed plug for few days now with. Schaefer’s penetro90 and PB blaster off and on still nothing stripping it out. really frustrated at this point on what to do safely any and all help would be greatly appreciated.
thank you all advance
 

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2000 Silverado Z71 4x4 5.3L 480k+ miles w/ GM rebuilt motor and trans
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Have you been using an impact on it at all? If not, try tightening it a little with an impact and then loosening it. The controlled beating may jar it loose.

After that, the only thing I really know to try is heat...
 
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