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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2007 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2007 Posts: 59 | I need the inside dimension of the bed. I think it is 4 x 6 but I want to be sure before i cut the metal. Thanks | | | | | Joined: Oct 2005 Posts: 1,317 Shop Shark | | Shop Shark Joined: Oct 2005 Posts: 1,317 | Hope you haven't cut your material. The inside measurement of my 54-3100, which I just took is:
If you are going to drop the material into the 1" recess the overall size would be 50 wide X 77-5/8" deep.
If you want the total length from the front bed wall to the tailgate it's 50 X 78-1/2".
In other words....the bed wood sits down in a recess that ends 7/8" shy of the inner surface of the tailgate.
If you cut a sheet of metal and laid it on top of the 50 X 78-1/2" you'd have to add a spacer to the cross members that support the bed floor. Laying material down inside the recess would result in you having a drop down at 7/8" in front of the tailgate but your metal would rest directly on the bed cross members.
Which ever way you go, be sure to measure the bed diagonally to insure that you have the bed corners at a 90 degree angle. Failure to square the box can give you fits when you try to get it bolted down and have your tires/wheels centered in the wheel wells. Hope this helps.
Dave | | |
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