When settin rear shoes, adjust them till they just touch the drums, then back them off one click. If they still touch a little bit that'll grind off in time.
There might be some other stuff up though.
Like a thrashed spider gear, or a parking brake stuck. Pull it apart and investigate
2000 Ford Ranger XLT: SAS, Sliders, Bumpers, Gears, Lockers, Shafts, 33gal gas tank, Shortened from 130 to 112" WB, Home brew bed and spare carriers,
Receiving: tons and a 351w stroked to a 427.
1972 Ford F250 "Explorer", 390fe Big block, lime green
Receving: 14bolt rear w/ disks, cam, 650cfm 4 barrel, intake, exhaust,