Looks like you have 2 choices. HO33 axle uses 5453778and79 which were replaced by 5455485and86. Spicer axle uses 2346825and26 wheel cylinders. If your third member bolts to the housing, it is a HO33. If the third member and axle housing are all one piece, it is a Spicer. Shoes are 3742645 for the H033 and 2346872 if you have a Spicer. These are GMC numbers. I am not sure if Chev and GMC are same. I only have GMC books and Hollander does not list a GMC for that year.
