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Okay the dreaded cab corner issue.

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Old 12-08-2014, 11:15 AM
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Everyone tells me I am f-ed. But say we do get new cab corners welded in? What keeps the new set from doing the same thing? All I'm trying to do is explore options that could improve the design or maybe a preventive measure for those who don't have rusted cab corners yet. From
What I can see and my test (using food colored water) the roof drains at top of each cab corner the water flows in behind the rubber seal it then drains right into a open seem in behind the cab corner, water does drain out the rocker if your truck is pointed nose down hill it will run through the rocker exit right under the front a piller (behind the front tires) but if you park flat or nose up the water kinda gets trapped in the rocker. If this is done long enough with dirt grit and road salt it perfect atmosphere for rust to take hold and eat inside out. The little hole I made I did the same test water drained right out the small hole I think this might drastically improve the water setting in the rocker issue. ?? Any one else experimented?
Old 12-08-2014, 11:32 AM
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Originally Posted by notastockdohc
Everyone tells me I am f-ed. But say we do get new cab corners welded in? What keeps the new set from doing the same thing? All I'm trying to do is explore options that could improve the design or maybe a preventive measure for those who don't have rusted cab corners yet. From What I can see and my test (using food colored water) the roof drains at top of each cab corner the water flows in behind the rubber seal it then drains right into a open seem in behind the cab corner, water does drain out the rocker if your truck is pointed nose down hill it will run through the rocker exit right under the front a piller (behind the front tires) but if you park flat or nose up the water kinda gets trapped in the rocker. If this is done long enough with dirt grit and road salt it perfect atmosphere for rust to take hold and eat inside out. The little hole I made I did the same test water drained right out the small hole I think this might drastically improve the water setting in the rocker issue. ?? Any one else experimented?
Read the link I posted.. You will see I'm equally as pissed off as you are, and have done the same tests as you..
That seam needs to be closed off.. The entire rocker section needs POR 15 and Maybe even a coat of plasticized paint on top of that.. The bed needs to come off to fix these cab corners, and this kind if bodywork is clearly not for a novice...

I'm by no means telling you your options are to go pound sand and **** in a hat. But I am saying that ford is definitely and intentionally staying quiet about this design flaw.. I'm all ears for any solutions.. I showed my damage to a few body shops for pricing, they all say this is a very common and time consuming repair.. The cost of this repair is likely 2400 to 3k for metal and paint..
Old 12-08-2014, 11:37 AM
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Shew 3k is ridiculous. I'd probably just sell mine hell with dumping that much money in a truck that just going to do it again down the road. So frustrated. I've got several buddies with these f150 as well all of theirs show evidence of corner rot. One of them is a non sunroof truck and it's worse that mine. Told then I'd try to explore options to slow the issue down or maybe a new idea for everyone to try.
Old 12-08-2014, 12:13 PM
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Agree with who ever mentioned it above. Paint the backside of the new panel( and where ever else you can reach) in POR paint. Maybe even put a coat of bedliner over top of it, and maybe on the front of the panel as well
Old 12-08-2014, 12:15 PM
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My personal opinion and this is what I'm going to do. Get the metal cab corner replacements I'm going to have it sent off to get acid cleaned then ecoated, then rino lined lol
Old 12-08-2014, 12:18 PM
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Originally Posted by notastockdohc
Shew 3k is ridiculous. I'd probably just sell mine hell with dumping that much money in a truck that just going to do it again down the road. So frustrated. I've got several buddies with these f150 as well all of theirs show evidence of corner rot. One of them is a non sunroof truck and it's worse that mine. Told then I'd try to explore options to slow the issue down or maybe a new idea for everyone to try.
I supercharged my truck and love it, so I'm definitely not gonna sell it.. I'm gonna fix it but it's obvious that a serious round of overkill solutions will also need to be applied to insure against future corrosion... Spending north of 45k to avoid 3k (tops) in repairs is not that rational to me anyway.. My estimates include POR 15, welded cab seam and sealing off the rocker from 2 different body shops.. I'm likely going to pay around $2200 to $2400 when all is said and done.. I also will likely get my rear bumper repainted (chipping) and a few touch ups on the paint where necessary at the time....

I've seen quite a few trucks locally with broken and missing cab corners, and I do have a buddy with worse rot than mine on his 06 no sunroof.. This is why I'm convinced that cab seam is main contributor to the problem.

RTV on the seam is a ok fix, or silicone caulking it with at piece of plastic cut to fit the gap will help.. My body shop said they will weld it closed which also works.. The sunroof drain should also be extended to reach below the cab.. Also make sure your 3rd brake light is sealed with weatherstripping.....
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Old 12-08-2014, 12:26 PM
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Lol I'm by no means buying a new truck. Wish my truck was supercharged but I've got a mustang in my garage with supercharger lol. So no need for one on my truck. I'm going to research and do more test on my truck and determine what steps need to be taken when I get new cab corners.
Old 12-08-2014, 12:31 PM
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Also found wd-40 cleans the tb really good. Without damaging the Teflon coating on the blade
Old 12-08-2014, 03:15 PM
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Okay guys let's do some comparing. My dad has a 01 screw the cab design isn't much different that the 04 up cab drain design. That big gaping hole where the rear cab seems are and water drains into? His model is full of factory seem sealer, my 2004 screw just a big hole for water to get into. Any of you have the newer models checked yours???
Old 12-09-2014, 06:37 PM
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Well today it rained and my new drain holes where letting water out so that makes me feel good no more trapped stagnant water.


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