^^^What Jock says it can make a huge difference. jack up and support on chassis to give full spring articulation. Wire brush, bash with a hammer, spray with something like diesel and old oil. Drive around for a week and repeat. Drive around for another week and this time spray with grease. I use carlube 100+ spray grease with the tube nozzle on to get into the spring gaps. after I did mine the ride height came up over an inch and ride quality is better.