So after I squared up the bed I started by installing the four center boards with strips. I used a semi deep socket with holds the nut out at the end. Took a small piece of windshield install tape to hold the 1 inch fender washer to the end of the socket. Worker really well. Then I installed the second and third cross sill to the center four boards. Then I located the side angle piece and drilled them to attach to the sides of the box. Two of the bolts holding it are fender bolts. The other bolts are all hidden from view from the outside. One nut is up inside the stake pocket at the front of the box. Leaving the two outside boards out so I can set the box on and locate where I need to drill the boards for the bed hold down bolts. In the last picture you can see the rubbing marks in the side of the bed from the cross sills when it was previously assembled. I'm pretty close so I must be doing something right. I can push up from the bottom to take the little bit of sag out of it and it's right on.
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Jeff
1964 Chevrolet K10 Fleetside
"A Kid's First Truck"
Follow in the DITY
1951 Chevrolet 3100
Follow his build in the Project Journals
1969 Chevrolet Camaro Convertible | 2020 Chevrolet Silverado | 3500 Duramax | 2021 GMC Sierra Denali
USAF Veteran 1983-1987 | PSP retired 1990- 2012