If the '51 GMC is the same as the '51 Chevy, you'll need two u-shaped crosspieces that bolt under the top flange of the frame, and a bar that holds the spare tire, which pivots on a rod hanging from the front crosspiece driver's side and is secured to the rear crosspiece on the passenger side. Here's a picture of the spare tire bar (lower left of the collection.) And a picture of the Factory Assembly Manual page showing the assembly.
Welcome to Stovebolt
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.