One problem related to rear suspension has been reported for the 1998 Nissan Frontier. The most recently reported issues are listed below.
Vehicle vibrates and shakes excessively at highway speeds, numerous repair attempts without resolve. Dealership beleives there is a problem with this model of truck and has told me that they have seen this problem often with this model truck. Manufacture claims no problem. So far I have had 3 sets of tires,gas shocks, several balances on tires and a tow package installed to try and solve problem. Dealership also mentioned trying to shim the drive train.