31 Model A rear spring

[Diastole]

Please advise: Rear spring bolt fractured!

My 30 coupe is getting an overdrive. I am in the planning stage.
The rear spring bolt is missing the bottom half. I can feel the fractured upper half in the hole and feel the nut end on top of the channeled cross member

What should I do in dropping the rear axle. As I let the axle down all but the last leaf should loosen and fall out and since nothing is retaining the spring it should be ok, correct?

Diastole in the Smokies