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I have a 2003 Suburban with the 4 wheel steering and it still works. Its kinda cool to turn around in front of my house without having to do a multi point turn. I think it failed for GM because of the cost. It started out as a $3k or $4k option (maybe $5k). GM got it down to maybe $2k but by then it was dead. It adds a lot of complexity to the truck. It makes servicing the rear dif a lot harder.
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