there is a tsb for the regular 6 that is for the upper control arm which adjusts the caster. since the caster is unadjustable a different upper conrtrol arm might be able to change this. i know my left side caster is more then right and i'm getting a pull to the right. so i bought a upper control arm that has less caster than stock on the left side to help solve this problem. not sure if thats whats wrong with yours but it is for me.