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Q: I'm needing a Switch Commutateur Interruptor, and I need to know what used for? on 2004 Chevrolet Trailblazer

I have a Chevy Trailblazer its a 4 wheel drive, the shaft front differential has a lot of play what would cause this? Also, the inside panel for the 2HI,2LO,4HI,4LO switch fluctuates on its own causing problems.
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Just call it a switch! What do you need a switch for,the 4x4 selector? How do you know it is defective?
Had it scanned?
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