My dads Jeep is unstable at 40+mph while mine is perfect stable at 80. We both have 4.5” lifts, anti rock sway bars 35s the only difference is the control arms we went with. Both caster and pinion angle it set very very similar to each other and have messed with his 15+ times seeing if it will help and sadly it has not. The only difference between Jeeps is I have core 4x4 control arms with Johnny joints all around and he went with metal cloak flex joints. I’m starting to wonder if the metal cloaks are causing the problem. Has anyone else heard of this being a problem?