I believe there is a TSB for the front CV shafts not being properly seated and causing popping noises. I looked through my saved stuff, but couldn’t find it. Maybe someone here will have the TSB info. If not your Service Writer may be familiar with it.What is your steering rack issue? I have had an issue with my new ZR2 only 1500 miles on it and it's having pops when turning the wheel hard backing up or going forward at slow speeds.