2002 blazer LS 4x4 grinding when in 4 hi

CavalierDad88

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2002 Chevy Blazer LS 4 by 4 when put into 4 wheel drive high every once in a while there's a grinding sound any ideas what it could be
 

zora

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may not be fully engaging.
there are some videos on a vacuum actuator that goes bad
 
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