My advice? Put a new rear suspension in it.

Looking at the shock placement, they are virtually useless.

The panhard rod should be parallel to the ground at ride height.

It looks like a 5 link without any upper links. Am I missing the upper links?

The cross member is "interesting". If you drop the cross member down to increase ride height you will mess up the LCA angles.

I am not a real big fan of 5 links but whomever did this had no clue.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.