Castor Correction – by Bushes, Plates, Drop Boxes or replacement Drop Arms – for lifts over 50mm (2″).
For lifts below 50mm (2″) it is advisable but not mandatory. Generally 4WD vehicles will have less Castor Angle than the equivalent year 2WD, and most 4WD’s will benefit with extra Castor above standard.
There are various arguments for and against the differing ways of achieving improved Castor Angles. Briefly: