This isn't a diagram but is the photo of a left front backing plate with shoes and springs installed that I jacked off Ebay. It may be sideways as the photo on Ebay was sideways and Photobucket is giving me a hard time today.
Link to photo
http://s173.photobucket.com/user/mr4...ml?sort=2&o=97
Things to note:
The shoe with the least lining always goes on the FRONT side. Meaning that the shoe with the most lining goes to the rear on both sides of the truck.
The star wheel on the adjuster goes over the slot in the backing plate on both sides. Also free the adjusters up and put a little bit of lube or antiseize on the threads before putting them back together. I usually screw them in and after having the shoes on and all the springs in place adjust them out so the drum just slips over the shoes so I don't have to spend a lot of time cranking on the star wheel with the brake spoon to get them out and tight.
I was taught to adjust them out so the wheel would not turn and then back them off 11 clicks so you had a bit of drag between the shoes and drum. That has worked well for me for the past 50 years.
Remember no greasy finger prints on the lining or the inside face of the drums.
Pack the bearings correctly with a good grade of wheel bearing grease before assembly.
I might have a better diagram in one of my books but will have to loo.