willysmjeeps.com

when i picked up the parts jeep it came with spare frame axles and spring front axle had a sprocket on it what is it for

bubba strikes again is my guess. There should be a dust shield behind the yoke and it's base is fairly thick so my guess is he needed a spacer and that is what he had.

i don't buy that that sprocket was welded on the yoke for some reason it looks factory it is a dana 25 my not be military

....do the hubs on the axle have fixed or manually changed lock-outs? I could see if they were free-wheeling that something chain driven could have been run off the impeller shaft.....just don't know what.

fixed hubs

Could be someone used the axle to power something and drove the axle with a chain from the power source. There are hundreds of possibilities but the odds of nailing it down are slim.