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Re: side rails
If you mean siderails as in nerf bars , it is possible that they have come a little loose or were not istalled properly. I do not know what style you have or if they install the same as the ones did on my 96 sierra but they bolted on using the existing body mount location and bolts. I would take it back to where they were installed or if you did it yourself, be sure that you put the ruber bushing back on the proper side of the brackets for the steps.
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** 2007 Avalanche LT. **

6" Pro Comp lift
305/55/20 BFG A/T KO'S
K&N FIPK GEN II
Flo Pro V force muffler & 4" slash cut stainless tips
Color matched front and rear Bowties
3" polished stainless bull bar and Nerf bars
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