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Old 07-01-2008, 11:44 AM
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Rear window edge rotten

The back window leaks like a siv. in my 1979 F250 4x4. I was thinking how hard would it be to cut an paste a new edge from a donor truck. Other then a poor fit with the seal, the outside looks just fine but the inside of the truck has 2 or so inches of utter rot above the seal. I don't understand why but i don't need to. How would the best way to go about this , or would it be easier to swap cabs. ( both have little to no rust excluding floors)

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Old 07-01-2008, 12:16 PM
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I would just do the donor piece deal myself..doing a cab change is a lot of work..Might be a good time to learn how to make patch panels from scratch as you may run into this same thing somewhere when there are no donor pieces available..

I have tried most all of it and now do what is known to work..
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Old 07-01-2008, 01:23 PM
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I would also do the donor piece. Swapping a while cab is a lot of work. Sounds simple, but it is not.

I have no clue what the shape of the part is, but if you cannot find a solid donor making a patch panel is not that hard.

Cut out fender:

patch panel made:

partially welded in:

I am working on this fender currently. I came inside for a drink. It is hot out there.
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Old 07-01-2008, 01:58 PM
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My recollection from my '76 and '79 F350's is that there is a doubled up piece of steel at the window opening. It isn't seal welded so any moisture tends to wick up and out. If the outside is ok, then a patch panel inside would work. My guess is that the rot is being held together by paint and you need lots more better metal. These '73 - '79 Ford pickups should be sitting just waiting in junkyards (oops, recycle centers) for an enterprising body person to chop out what is needed for a very reasonable price for patch panels. You need a new window seal too.

Dave W
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Old 07-01-2008, 09:20 PM
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Hey thanks folks
Ya its the inside thats all rotten. And yes the two shells ( outer/inner) meet together for a seam. I can weld... I learned ark when i was very young then did mig in school but haven't done any for some time. Seems i'll have to get back into it. Also its a hard driven 4by and interior doesn't matter much, to me anyways.
A friend that bought my last truck ( i slid off road and hit a culvert then a huge bolder on the side of the mountain) said sure man i got all i need out of it.. cut out what you want , if you want to leave a dozen friends behind i'd be happy" so i'll get out my cutting disc.
good to know that some people work on the " old way of thinking "
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