get the lift & the tyres done first, have a wheel alignment done, have them balance the new tyres, replace the steering dampner whilst you are there, have the front bearings tested for movement & roll, always buy quality suspension, Old Man Emu is a good safe bet, then see if you still have the steering & shudder issues, this will eliminate most problems & point you more in the direction of issues if it persists, spend your hard earned coin on new decent tyres & good suspension, this will set you up for years