They are all loud. It's an empty metal box.
Ride? You can get the springs altered. They are two leafs, so there's some options there. I plan on having mine redone. I haven't talked to the local spring shop yet so done know about what it will cost.
It all depends on what you want done. Ride height adjustment won't change the quality unless the work stiffens of softens the spring also. They can build anything you want if you have the $$$.I know the axles can be re-arched, I was wondering if that changes ride height and ride quality, or just ride height.