On The AFX spindle the location of the steering arm as been revised to help improve the bump steer when using (ideally) the short Z28 steering arm. if you are very concerned about bump steer no matter what suspension parts you use you will need to invest in a bump steer gauge and learn how to use it. bump steer is a very finicky thing to adjust. ride height and caster setting both change bump steer. so first you have to get those figured out. then dial in the bump steer based on how you set the static Toe, so for street if you set the toe at say 1/8 total toe in then when you adjust the bump steer it needs to be adjusted so it only bumps in and does not got from in to zero and then either in or out. if you set it up for track at say 3/16 toe out then you need to adjust the bump curve only goes more OUT so to say one part The AFX spindle "Fixes" bump steer is a bit of a Vague question. Same goes with the Ridetech TruTurn
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