I drive a Kenworth t680 and about 2 months ago while I was in California I started noticing a cracking & popping noise coming from the left front wheel area when I was in creep mode & turning the wheels left or right.I ended up going too a Ta and they lifted up the left side and It looked like the front wheel was about to fall off. I never seen anything out of the ordinary while doing my pre trip. The truck ended up going too the dealer and having a kingpin replaced and some other stuff which was about $3000. Everything seemed ok for awhile, About 2 weeks ago I started hearing the cracking & popping coming from the front again while in creep mode in traffic. I have no idea but it doesn't sound to good. Does anyone have any idea on what this might be?