X2, good recommendations from Dempsey.
Are you also getting wandering, hard to keep between the lines?
If you are running a lift, check your caster angle. Insufficient caster angle caused by lifts will cause wandering.You should be running 5 to 7 degrees positive caster. Steel shims are available tp place between the spring and axle pad to correct caster. (Never use aluminum or other soft shims)
here is one good source, if you ind that you need them:
4Crawler Offroad Products - Custom Leaf Spring Shims