Find a service manual for your truck, like this one, to explain the procedures. Take off the drums off both sides, but, only take the shoes off one side so you can see the other side for reference. Clean everything real good and repack wheel bearings and seals while you are at it. Let us know how you are coming along.
http://www.gregsonline.com/eshop/Shop_Manuals/64TSM.htmMost of the parts you can buy at local parts stores. Check NAPA for new drums if they are out of spec.
