Axle problem

The center bolt in the spring must be sheared off. Head of the bolt fits in a recess in the axle to locate it . Will need to pull that side apart and replace the center bolt . Not bad repair.

 

Sadly only one way to check , unless they are showing signs of movement. That's take them apart the checking, if you do that I would go ahead and replace them , labor will be the same. But I would not do that till you see signs of movement. How long ago did you buy this one ?

 

Thinking about 2 hours per spring. Ubolts can be a bear. Usually replaced them when taking them apart, so I cut them instead of wasting hours .

 

I'd replace both sides u bolts as they are most likely stretched from the movement. It is always recommended to replace them rather than reuse them.

 

This.
Go ahead and replace the pins on both sides of that axle, along with the U bolts. I have welded the spring mounts to the axle in the past and never had an issue (due to time restraints etc) but that is your call.