Maintenance Improves Handling: Perhaps you have a 4x4 that has more wander and play in it than it used to. Ball joints and suspension joints can wear out more quickly then you think, diminishing handling performance. We replaced or rebuilt all the joints on our long-arm suspension after finding a couple of worn sides. We also used Synergey heavy-duty ball joints in the front end in hopes of getting more miles out of them then stock ones. The difference after changing out those joints was greatly apparent, and we all realized that our Jeep was more out of alignment then we thought once everything was tight.