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the FLCA, t-rod, and FLCA bushing axis (the red centerline in the picture) form a right triangle with the 90-degree angle between the FLCA (which runs laterally - side to side of the car) and the FLCA bushing axis (which runs longitudinally - front to back of the car). So, the points where the FLCA and t-rod attach to the chassis are in a straight line (that line is the FLCA bushing axis). But, because the t-rod bushing axis (blue line in the lower left of the picture) is not co-linear with the FLCA bushing axis, you have to add another degree of rotational freedom to the t-rod attachment (flexible bushing or spherical bearing). 
 "The more "F" and the less "m" you have, the more "a" you can get." -- Brian Beckman, The Physics of Racing |
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