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'72 & earlier trucks never had automatic hubs. Automatic hubs were pretty whimpy & unreliable. '72 factory hubs were pretty good. Not many broke unless the truck had big tires & plenty of horses to boot.
The locking hub is easy enough to pull off & check. 6 hex head screws & it'll come right out. It'll be obvious if its bad. While its out, lock the other hub & put it in 4wd. You should not be able to turn the axle shaft on that side. If you can, then its your spider/side gears in the diff. I've seen a lot of folks take out the spiders & side gears while backing up pulling something... myself included.
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'71 K20 Custom Deluxe - 1 owner - Original 350 & 4 spd, Rams horn dual exhaust, Centerforce clutch, K&N 4"x15", factory tow hooks, 4" Skyjacker Softride, Rancho RSX9000s, custom Firestone AirRide overloads, 36" 305/85R16 10ply Buckshot Mudders, 4.11 gears
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