Hello All,
I'm not saying what will work for the '47-'54 truck frame but just saying what worked for my '39.
So, it took a long time to figure out what tank to use for an under bed gas tank and finally went with a custom 26 gal stainless steel tank from Rick's tanks. The tank was measured and fitted by using a '39 they had in the shop. They sold me on not having to removed or modify the rear frame. The rear cross member didn't have to be removed or relocated. I don't know how the filler neck will effect the bed since I do not have a either one yet.
Here are a few pics.
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Bread
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