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Hi I have a 2011 gmc sierra crew cab,. when putting on my nerf bars all but one bolt tightened . now there is squeeking when I start and stop. I think the nut slipped while
I was tightening it. the bolt feels like its tight but not tight enough. now i think its cross threaded. so I want to access it from inside the cab but before I do so I want to have all the parts needed.I need to know what size is the body bolt and the retaing nat are . I can find the info anywhere on the internet. please help. thanks Tim ODonnell
