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is there an expanding foam spray that will quiet the wind noise in the cab of my 63 gmc

There is a foam used for cavity filling but I wouldn't recommend it.(It's actually intended for cavity walls in houses)

Problem being it also retains moisture i.e. condensation/damp.

This could be a major problem as I see you're from the frozen North!

I used it a few years back in a VW Bug I had and it was a nightmare,it caused some panel repairs I had done to bubble up with rust.
Basically it acted like a sponge.

wind noise or road noise? if it's really wind noise you likely need new weatherstripping someplace - road noise can be lessened with "peel and seal" discussed at various times [interior forum] or the foil backed bubble pack style insulation - inside doors, behind the seat and on the floor

Bill

[: i,ve done the dynamat,and new weather stripping just thought there might me more i could do, thanks

Do you know where the wind noise seems to be eminating from?
Bear in mind these old trucks had the aerodynamics of a small house!

I'll bet it coming from around the doors somehow. Did you cover the entire inside with the vibration dampener?

you can also use spray on bed liner to deaden noise thru the sheetmetal. you have to stop the wind by fixing the seals to stop wind noise.

Also you should have use the dynamat on the inside of your doors

After painting up my truck and installing new weatherstripping, I noticed I can actually see daylight thru the top inner corner of my door. I was riding shotgun with my friend in his restored '56 and noticed the same thing. Keep in mind that the door is aligned on the outside, as well as I could get it and I don't think this thing suffered some sort of cab distorting event. So, I'm thinking the above post by jockbolter is a pretty good description of what we are up against with these old pieces of farm equipment. In my mind, I do another incarnation of this truck that includes either laying up lead in those spaces or perhaps lamination with sheet metal to reduce those gaps and actually make the weatherstripping a functional component. And, I thought about using that spray foam normally used in residential and spraying in the various body cavities and channels but decided it may not be a good idea in case it prevents those areas from draining. Glad to see someone confirmed this and that I hadn't made that bonehead mistake. (no offense to our friend from the great isle of the north). For now I'm thinking of laying up more weatherstripping as long as I can make it look like it belongs but haven't gotten around to it.

Skippy - being the only up north Islander posted on this thread, I won't take any offense at your not making bonehead mistakes I not only agree the spray foam is a bad idea [and unlike many bus converters, I won't use it], I agree most folks are just expecting too much from these old workin mens trucks as a result of spending most of their road time in new cars .... OTOH, the bubble pak stuff does pretty well in a lot of places, with a bit of spray can undercoating to hold it in place

the way to deal with those gaps you've wound up with is some judicious bending with 2x4 in the door opening, the TF series is a particular problem that way, with the dogleg - I doubt any [well many] of them came off the line with those gaps .... of course the time to do that is well before final assembly and paint, but with care it can be done on the finished truck, doubled or tripled weather strip won't hold up long if you're really gonna use the doors much, and looks goofy

Bill

thaks guys i guess im expecting to much from the old girl