1990 lwb and its crap on the highway and im not sure if I'm just expecting to much from it. 65 is the max, it could go faster but at that point is shaking pretty good. I have replaced both user control arms, all the ball joints and tie rods, new Cooper at3 tires and fresh alignment. It wanders alot at speed and there is vibration that feels like maybe a u joint maybe. But maybe that's the way it rides I know its 24 year old truck at this point