[Mark SC&C]

Stock A body bumpsteer is really bad. Total toe change over 6" of travel on a dead stock A body with stock alignment specs is over an inch! I know this because I`ve measured it on a number of them. Most of this is due to the outter tie rod ends being about .625" too low (the tie rods are also the wrong length but that`s a secondary concern in this case). This puts the apex of the arc the tie rod end swings in and the apex of the arc the steering arm and spindle swings in (and which is eliptical BTW) way out of sync. As the arcs diverge the spindle turns. The B body or 2nd gen F body spindle steering arms are about .625" lower still which roughly doubles the already poor bumpsteer. They`re also longer which messes up the ackerman angle,slows the steering ratio and increases the size of your turning radius. Adding aftermarket arms like GW (or ours) can help it *a tiny bit* by adding more + caster. That`ll A) help the car track a bit straighter and B) raise the outter tie rod end maybe 1/4" which frankly is too little to do much good when it`s this far out of whack. This is all very simple geometry,no smoke and mirrors and quite easy to measure.
The typical aftermarket "fix" is to add huge swaybars,stiff spring and shocks to limit the total travel you typically use. Double the bumpsteer but halve the travel and although the rate of bumpsteer has doubled you can say "look no increase in *total* bumpsteer!". Kinda like going to the doctor complaining it hurts when you raise your arm above your head,so he ties a string between your wrist and belt so you can only lift your arm half way. Voila! You`re cured. Pay the nurse on your way out please. :clonk:

Have heart though,there`s a VERY EASY FIX! Just don`t put the wrong spindles on your car in the first place. Today there are MUCH better solutions. Mark SC&C