Do shocks rattle when they go bad?

[90'5.0 Conv]

I had my wife push up and down on the back of the car today because I got a rattle. I thought maybe I did something wrong with the gear install but now I'm leaning toward the left rear shock. I know it's bad because theres fluid all over it. It seems to rattle when I go over bumps more so now then it did before the gear swap. Think it might be from having it fully extended for the 2 weeks it was jacked up in the air. I was real worried the other night cause it did it when it downshifted. It's the same sound though. What do you think?

Thanks, James