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Find another GM dealer. The front suspention knocking may be coming from the steering shaft, apparantly something that needs ot be lubricated very regularly. My 05 Silverado did what you are describing about a year after I had it...they replaced the shaft once, and then lubed it the second time I brought it back.
If a dealer is not honoring the recall you did the right thing by reporting them to GM. A good dealer will give you a survey after maintenance that gets turned into GM. Since you did not get service, I would go to the secretary and try to get them to just give you one. Submit it to GM, and see what happens.
Not much of a help, sorry.
John
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