Did you try looking at your upper control arm bushings. I have a 1994 Blazer that had the same noise. I looked over the whole front end and couldn't fine anything wrong. Everything had been replaced before all with in the last year due to age and deterioration. The only thing I didn't change was the upper control arm bushings. I saw just a little cracking on the edges, but nothing major. Anyway I went ahead and replaced them. $35 later. Squeaky FREE!!!!!!!!