stub axle is inside the drum brake so i cannot circle it. its the spindle the wheel and brakes ride on..

there is nothing wrong with a solid rear axle like that, honestly. cars with the solid rear perform just as well handling on the track, the driving characteristics are slightly different though.

you can buy a rear beam used for $300 on ebay, shipping will kill you though, i expect it to be $400-500 at a local yard. but new bare axle from gm is $470.. (notchback is $672 but its the same bar?)

figure 2-3 hours to swap, 2 hours for brake work and bleeding and then an alignment..

a stub axle is $104 new from gm, and would be likw 2 hours total, plus an alignment..

or if you really screwed it up you will need both, in that case get the used axle put in.