What would cause the 4-wheel drive to kick in, but not work?

2004 CHEVROLET BLAZER

154,220 MILES

LLOYD JR

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I have already changed 3 parts, one on the front differential, one under the battery. Still is not working. when i try the front wheels don't spin or do what they are supposed to do. Please i could use any advice.

Dec 16, 2011 at 8:48 PM

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