I might be wrong, but I believe that is for a 2020 pickup.
Ok so that model number covers a variety of years.
The link from df2x4, is the correct model but still doesn't have the width/ height of the frame, just lengths.
Hi, I have a 2000 k3500 classic style crew long bed dually. I am planning to put a service flatbed on this truck in the future and wanted to see if anyone had a diagram of the rear frame. I have found examples for cab and chassis trucks but nothing for regular frames so far. Thanks.