2" Lift Kit GQ Wagon

[Bigrig]

Howdy I get a shudder with the GQ around 80 - 90kmh but it goes away under or over this I replaced the Steering Dampner, Panhard Bushes and fitted New Tyres and this seemed to help and now Im just fitting a 2" Lift Kit in the Old Girl and was wondering if I need to fit the Castor Correction Bushes?

Have you fitted offset wheel rims recently?? Ackerman angle and scrub radius changes due to offset rims can cause a wobble/shudder also ...