Drop coils on 60...bolt twisting

[MASTERBrian]

Trying to swap the rear coils on my 60 burb and the lower bolt that goes through the coil cup is just twisting at the head. I see absolutely no movement of the nut or the portion of bolt sticking up through the nut. My guess is if I keep twisting the head will break off.

Is this ok or not? I guess what happens of the bolt snaps...can I just compress the spring and sould the rest of bolt just come out then or will I have a mess on my hands?

I'll admit I've never replaced coils before, but seems straight forward and I have the compressors that fit on the outside. I have the shock taken off and the rear end on Jack stands and Jack under frame. Hope this is correct...

[PGSigns]

What happens is the bolt rust in the trailing arm. I have had a couple over the years that were half gone when they broke off. I always hit the top with PB blaster and let it sit a bit then hit the bottom with the impact while holding the top with a wrench. Some times the bolt comes out sometimes the head snaps off. Then if it snaps off just let the rear down a little to put some pressure on the bolt and work it out with a pry bar. Then the plate goes in a vice and the piece left gets pulled out. I always put new bolts in top and bottom.
Jimmy