I was using the search feature to read up on rear brake issues and I found this old post that matches what I found last night when I pulled my drums. The front shoe is worn down almost completely while the rear one has lots of life left. Did you ever discover what was causing this to occur?

My drums are badly scored/grooved also. I'm going to try to measure them before I take them to be turned to be sure that I have enough meat left. Now I know what's been causing the terrible grinding sensation I get when I use the brakes.

97 T100 4WD SR5 - 231K