I came across your post because I'm looking for some info on fog lights concerning 2005 Yukon Denali's. Anyway, where does the noise seem to be coming from? Front, rear, outside, inside? Generally speaking since the ticking stops when you stop the vehical, it's related to either the drive train or wheels. My guess is that this is a result of changing out the drive shaft. Did you change any of the drive shaft couplings? (u-joints, ect.)
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