b'GM F/X AXT-STARWhere Do We Start? Your 60s-70s GM Car was built with 1/4" tolerances in every location & these add up. The Factory was building a Product to Sell, not a race car. Unfortunately, your driver & passenger lower control arm pivot axis points (lower buckets) dont match. Until we fix this, the car will never handle the same on left hand & right hand corners. So, lets fix it with our LCA True Axis Kit.Lower Control Arm True Axis Kit & Technical Support: oIncludes a Precision Ground True Rodto Guarantee You Have True Pivot Axis.oAfter Measuring Your LCA Buckets (Instructions Provided)Ron Sutton Provides You with theMinor Modifications Needed to Shift the Holes &Match Up Both Sides oYou Will Have a True Pivot Axis, Plus Improvethe Anti-Dive & Caster Gain Geometryo8 Steel Washers 1.50 OD x .220 Thick Weld on the Outside of the LCA Buckets. TheTrue Rod Aligns Them for You to Weld in PlaceTech Tip 20: The shock Motion Ratio (MR) of yourlower control arms play two important roles. First is understanding the higher the motion ratio the bettercontrol your shocks will have over the suspensioncreating more grip.On the lower control arm (LCA), the closer the shockmounts out toward the wheel, the less leverage the LCAhas over the shock & the more control the shock has over the wheel. Shock control is good for grip. Being out closer to the wheel, the shock can respond quicker, which allows the shock to keep the tire & wheel loaded over the undulations of the track surface a higher percentage of time. Plus, the shock travel is closer to wheel travel providing better valving control.Second is figuring out what spring rates you need to achieve your target wheel rates. The raw MR formula is BC = MR. For example, a 16 control arm (C) with the shock mount (B) at 12 = .75 MR (Raw) To get your final motion ratio, we take the raw MR, square it, then multiply by the Cosine (CoS) factor for the shock angle. The Cosine factor varies with the shock angle, but for an example shock angle of 15 the CoS is .966.Carrying on with our raw MR of .75 example, the formula would be .75 x .75 x .966 = .543 final motion ratio. So, if we want a 300# wheel rate, we take 300#.543and figure out we need 552# springs. So, we pick 550# springs & live happily ever after in Victory Circle.All RSRT & Speedtech Extreme Lower Control Arms have been designed with high motion ratios for better shock control & grip!573'