Sealed ball joints with no grease fittings are great the first few years, but when the rubber/plastic seal fails, and the grease works out and/or gets contaminated with dirt, replacement is the only option. Chrysler complicated replacement with lower ball joints that are riveted to the control arm. Each of the two lower ball joints had 4 rivets. I had to grind 16 rivet heads off, and drill out 8 rivet bodies to remove the old ball joints. My tools were a Dremel, 25 cutting wheels, a drill, and one titanium drill bit. It took about a week, working a couple of hours every night. If I had it to do all over again, I would buy an electric grinder.