Leaf springs shot?

[agnes the dog]

I'm chasing down a rear vibration following an axle swap. I've found that there is some lateral movement in both rear leaf springs, with more on the passenger side. I can grab it by hand and move it back and forth about an inch, maybe a little more. It seems to be rocking on the spring mounting pins, front and rear. I'm assuming the bushings and pins may be shot, but haven't had the time to completely pull the springs. Anyone else run into this? If so, how did you fix it?