My lug nuts got all gouged up and the threads got stretched from my impact gun and torque stick. I got another set of lug nuts and now I only torque them with my TQ wrench. Even with my wrench they are starting to gouge. I've never seen metal this soft on such a high load area before.It happened because GM decided to use rejected Russian bomb making metals from the cold war era to make all the nuts and bolts for our car. Not only have the wheel studs been a huge problem for Cobalt owners but so have the strut tower studs.
Its seems the ones affected by this are the older cobalts with the steel wheels. I've had a few display the same problem. Haven't had the opportunity to do an '08 yet. The aluminum wheels on the SS and SS/SC seem to have higher quality lugs and a better lug nut seat design.i am a mechanic, and have had a busted wheel stud, and on top of it all, it was because i had used a hand ratchet to put it on. I have had no issues as of late with the torque stick and air gun on the cobalts.
because an impact gun WITH a torque stick(proper torque stick) does just as good as a torque wrench. Almost every shop i know of(including the dealer) uses torque sticks and impact guns.i am sorry to say if you dont use a torque wrench and one that is calibrated often you are pretty stupid on any rims alloy or steel. you wouldnt use an impact on headbolts, or any other critical fasteners, why compromise torquing down something that holds your vehicle up.