You might get away with it for a bit, but its just a matter of safety, id get some spacers ASAP just so you dont have to worry about it, especially if you're loaded down with a trailer...
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'07 5.9 Mega Cab 2wd/G56
Smarty, Green CAI/Amsoil filter, Guages, 5" TBE, 2.5" Drop Shackles, MyGig Nav
