There are a series of Drain Holes that become Plugged if not cleaned regularly that causes that problem. It's all part & parcil w/ the Fresh Air System w/ the "Orphan Years" , '57-'60 Trucks. Find yourself a Good bodyman & just have the bad section replaced. That's what I'm having to do w/ Uncle's '58 Mercury M-100 Truck.
where are you from? i know a place in glenville minnesota that might have what you are looking for. i just got a bed from them for my 56 and i know that the truck it came off of was at least a 57 or newer
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