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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Bed damage

 
  #1  
Old 11-03-2017, 07:53 AM
applebaggins
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Bed damage

I'm getting ready to fix up and drop a replacement bed on my 1978 F250 and had some questions I was hoping someone could answer! Total noob here, but learning a little more every day.

Is this damage cosmetic or should I get some scrap metal welded in there for structural support?



I'm replacing the panels soon. Do I need to straighten these arms before putting the new panels on? Are the arms meant to bend to adjust to the panels?



Finally, what's a good treatment plan for the undercarriage? Rubberized coating after cleaning it up and priming it?



Thanks!
 
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Old 11-03-2017, 08:48 AM
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That is rust, not cosmetic damage. If you want to make it last, cut out the rust and replace with good metal.

Those support brackets are suppose to be straight. Also before you undercoat it with POR15, or a DIY bed liner kit like Herculiner I'd...

Drill out the drain holes red circles and clean out the red arrow areas and then make some big drain/clean out holes in the blue box area.

Dirt/moisture/road salt gets trapped in there and that causes the common Ford truck bed fender lip rust.

I have seen pic of a front fenderwell plastic liner made to work on the rear. Good idea.
 
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  #3  
Old 11-03-2017, 09:28 AM
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Make sure you open up the bed drain holes suggested above, very good tip. Do all metal work to the bed and complete it before bed lining, its not too easy to get off later.
 
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Old 11-08-2017, 09:59 AM
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Originally Posted by 77&79F250 View Post
That is rust, not cosmetic damage. If you want to make it last, cut out the rust and replace with good metal.

Those support brackets are suppose to be straight. Also before you undercoat it with POR15, or a DIY bed liner kit like Herculiner I'd...

Drill out the drain holes red circles and clean out the red arrow areas and then make some big drain/clean out holes in the blue box area.

Dirt/moisture/road salt gets trapped in there and that causes the common Ford truck bed fender lip rust.

I have seen pic of a front fenderwell plastic liner made to work on the rear. Good idea.
How big are we talking for the little drain holes and big drain holes? Do you have any example pictures or can give you me an idea of size?

Thanks a million!
 
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Old 11-08-2017, 10:52 AM
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In addition to the good advice above, before you paint it with por15 or rustseal or whatever, I strongly recommend using a 4.5" angle grinder with a 4" knotted wire wheel from harbor freight and giving the whole thing a good once over. youll be shocked at how much crap this takes off! wear safety gear and a respirator. If you want to get meticulous, they make smaller diameter wire wheels you can put on a dremel or drill and get the harder to reach areas after. you can get near sandblast results doing this.

I'm a fan of rustseal paint, but more important than the paint is doing good prep work and wiping it down with wax and grease remover.

That being said... nothing removes rust like sandblasting.

If I were to restore my ford again, I would have scrapped my bed, and driven to Arizona to buy a straight rust free one. if you spend $1000 doing it, youll save 200 in products, a few hundred of your own labor, and sell your current bed for 200 bucks... and have a much better end result... just a thought.
 
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Old 11-08-2017, 01:25 PM
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Big enough that normal road dirt/debris will not build up and clog up the holes.

I'd say the red circle ones are pretty big so just a little bigger, the red arrow/blue box the bigger the better IMO.
 
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Old 11-08-2017, 06:47 PM
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On the rotted areas... yes cut them out and replace with new metal. This is the starting point of a durable repair. Good coating is a bonus. Red Rustoleum primer + Rustoleum satin black is effective over solid metal... and there are lots of other choices for coating.

The bent support arm needs straightened. The tab that bolts to the body may need adjusted or replaced. Get the body panels straight first and adjust the arm as needed.
 
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Old 12-20-2017, 12:55 PM
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77&79F250,

Could you clarify on the blue box location: are you recommending drilling the fender lip itself, or the lower portion of the inner fender? Thanks in advance for the clarification, I just want to make sure I am understanding correctly before I start prepping my replacement bed.
 
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Old 12-20-2017, 01:49 PM
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Glad to see this issue come up. I couldn't find a replacement for my short bed 79 so I'm having to make burlap purse out of my sows ear. hope to follow your progress. if you need bed bolts check cj pony car parts. original style kit was 24.00 including shipping.
good luck
 
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Old 12-20-2017, 02:30 PM
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Originally Posted by 78 F250 FAN View Post
77&79F250,

Could you clarify on the blue box location: are you recommending drilling the fender lip itself, or the lower portion of the inner fender? Thanks in advance for the clarification, I just want to make sure I am understanding correctly before I start prepping my replacement bed.
Lower portion of the inner fender.... big enough to get your fingers or some sort of tool to clean out the gap between the inner fender and wheel arch. I cut my inner fender to one inch of metal, two inches of gap, one inch of metal, and so on. I use a toothbrush (with the handle sharpened to a point end) to remove trapped/wedged pebbles and small stones.
 
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Old 12-20-2017, 03:08 PM
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Originally Posted by HIO Silver View Post
Lower portion of the inner fender.... big enough to get your fingers or some sort of tool to clean out the gap between the inner fender and wheel arch. I cut my inner fender to one inch of metal, two inches of gap, one inch of metal, and so on. I use a toothbrush (with the handle sharpened to a point end) to remove trapped/wedged pebbles and small stones.
Now this has me debating if I should weld in the inner fender arch that I bought to replace what I cut out.... It wouldn't look factory, but I could weld in a series of braces that provide the same support, but none of the debris-collecting hassle... Hmmmmm

I've been really apprehensive about welding those two lips over each other because I'll never know if the inside is sealed up right or not. I was thinking of a wax based winter sealer, but being able to see and clean out the fender lip would be a huge bonus.
 
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Old 12-20-2017, 05:29 PM
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Originally Posted by HIO Silver View Post
Lower portion of the inner fender.... big enough to get your fingers or some sort of tool to clean out the gap between the inner fender and wheel arch. I cut my inner fender to one inch of metal, two inches of gap, one inch of metal, and so on. I use a toothbrush (with the handle sharpened to a point end) to remove trapped/wedged pebbles and small stones.
Thanks HIO! That is what I had suspected, but I wanted to be certain before I started cutting on mine. Finding a clean replacement bed in my part of the country is no easy task, so I want to get it right the first time.
 
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Old 12-20-2017, 10:15 PM
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IMO lower portion of metal inner fender or X2 what HIO said. NOT the bed fender lip, but the metal piece that is put in there, where it contact the bed side.

The more open the better and easier to get something in there to wash out the area. See the post #2 pic 2 top red circles? See how big those inner drain holes are?

Its always the outside where the metal piece is in contact with the bed side that rusts.

HIO thanks for the cover down/back up.
 
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Old 12-20-2017, 10:26 PM
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Originally Posted by 77&79F250 View Post
IMO lower portion of metal inner fender or X2 what HIO said. NOT the bed fender lip, but the metal piece that is put in there, where it contact the bed side.

The more open the better and easier to get something in there to wash out the area. See the post #2 pic 2 top red circles? See how big those inner drain holes are?

Its always the outside where the metal piece is in contact with the bed side that rusts.

HIO thanks for the cover down/back up.
77&79F250,

Thank you very much for the follow up. It is awesome to have such helpful folks on here who are willing to help. Much appreciated!!
 
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Old 12-20-2017, 10:55 PM
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We are all here to learn, help and enjoy our Ford trucks. How ever you work it out, post some pics and show us what you did to make those drain holes bigger.

Rusty bed fender lip owners want to know, including me. lol
 

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