You are partially correct Mike. On the '47-'50 1 1/2 & 2 ton trucks, the drum, & hub, are removed together. On the '51, & up 1 1/2, & 2 ton trucks, you do indeed, remove 2 slotted screws, then remove the drum, from the hub.

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery