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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jul 2006 Posts: 232 New Guy | | New Guy Joined: Jul 2006 Posts: 232 | J.H.Proffit
Agreed the GMC bed floor is steel.
My 39 GMC has an inside bed width of 48 1/2 and a bed floor length of about 77"
According to Mar-k my bed width should be 45 3/4" with a length of 89 7/8"
They do not give specs for a 40 GMC bed. 1940-46 chevrolet show the same masurements as my 39 GMC 48 1/2"x 76 7/8". | | |
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