If your truck had an overflow container it was an accessory. I don't know what it would look like on a '55-56 GMC but I have seen one for an AD Chevrolet.

I'd pose this question at oldgmctrucks.com . Ol' Kook just might have a picture of one somewhere.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.