One problem related to suspension torsion bar has been reported for the 1998 Lincoln Navigator. The most recently reported issues are listed below.
While driving, the left tie rod separated, which almost caused an accident. While driving, the right tie rod separated. (all parts were replaced by the dealer) the consumer was able to stop the vehicle without causing an accident because both failures occurred at a low speed. When the tie rod broke, along with the inner binding, the reaction was extremely violent and difficult to control. The left inner and outer tie rod end were replaced. The sway bar link had broken. (the right tie rod end and sway bar link was replaced).