So are a few of us 340 powered, 100 mph FJ-40 owners. Part of the problem with 4x4's is slop and play as well as poor geometry. Jacking them up without correcting caster is a problem. One of the smartest things I did with the old Landcruiser is to duplicate a late model IHC Scout trick---Crossconnect the front shackles with a single leaf spring. THAT really WORKS