Leaf springs...

[arch_stanton]

This is usually caused by loose U bolts, the U bolts need to be retightened after being installed and can also stretch over time. You should be able to hit the springs back into alignment with a hammer then tighten the nuts with a big cheater bar or a big impact but sometime the impact is not enough.If the nuts are real loose the springs could have shifted and sheared the center pin on the springs it will then need to be replaced to make sure the Axel is allined,get some new U bolts while your shopping.