Frank are your sure that truck is a 4400? A dump truck is often a shorter wheelbase, like a 4100. The 4100 did share the axle with the 1-ton truck, but I think the 4400 was a bigger axle.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more... It's true. I really don't do anything but browse the Internet looking for trouble...