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Old 09-14-2014, 10:03 AM   #4
russgt
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Join Date: May 2008
Location: Waukesha, WI
Posts: 904
Re: is this rust common ???

It is most likely caused by water and debris getting kicked up from the rear wheels and sitting up in between the floorpan and the rear crossmember. Its not an area that you can clean out real well while washing the truck.
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