4 Runner Ball Joint Failure . Too many of these running around without that failure. The way that Toyota designed them on these trucks is just stupid. Ball Joint Upper Control Arms | DK-812901 - 4Runner/FJ ... (Harriet Pearson) The lower ball joints are NOT a part that you want to cut corners with. A ball joint is essentially a flexible ball and socket that allows the suspension to move and, at the same time, the wheels to steer. How long are the ball joints supposed to last? Out with old and in with new. In the meantime, does this sound like a ball joint failure? Lower ball joint failure on uneven ground - Toyota 4Runner ... New Twist on Lower Ball Joint failure - Toyota 4Runner ... Dirt King Ball Joint Upper Control Arms for 2003+ Toyota ... Ball Joint Failure - My Turn - Page 4