Originally Posted by ArmyofOne
it wasnt foam, it was the type of metal they used on the inner fenders from 2002-2008. There were gaps in welds in the bedsides as well that allowed salt water in but not out.
Down south we see no rust, so its definately restricted to the salt belt.
So they changed the metal and fixed the welding gaps after 2008 I assume?
I haven't had a real good look at mine yet, but with the plastic inner fender wells, I am not sure I will be able to see much anyways?
On my last 2 Sierra's, there were little slots around the circumference of the inner wheel well, I sprayed up in there every time when I washed my truck, especially in the winter time and was surprised how much crap (Sand/dirt and likely salt) that I could get out of there!