I think if you pull the hub off the truck you'll see those bolts hold the drum to the hub, not an extension to the hub.

However I know an extension as you describe does exist and your truck could have that instead of the standard dually hubs.


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...