NASTY DIFF FLUID! how to and why you should! GENERAL MAINTENCE

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Canging the diff fluid on my 2002 gmc sierra 2500 HD.
Why you should do it and how to do it
basically the same for every vehicle
Normally ill change the diff fluid every 4 years or 50k miles
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[@brettlynn4969]

Thanks for the videos.One question about replacing rear differential,is there a replacement gasket or what’s up?