X2 Joints Necessary?

Jbauer said:

just 1/4? mine lowered almost an inch, i didn't use the spacer that came with it

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When a Mustang is lowered, the front roll center changes due to the new
position of the suspension pivot points. Lower the car too much and the
front roll center drops to well below ground level, and worse than that,
the roll center moves side to side as the body rolls, resulting in lost grip
and erratic handling. The lower roll center causes the body to roll more
easily. Countering this tendency usually requires a significant increase in
front spring rate to simply control the added roll due to the lowered the roll
center. This higher spring rate not only hurts ride quality, but it also
reduces grip on rough surfaces, as the stiffer springs cause the tire to skip
over bumps instead of following the contours of the road. The X2 balljoint
was designed to eliminate these problems by correcting the front roll
center geometry. The X2 balljoint has a longer shaft, to raise the spindle
relative to the balljoint pivot point. Spacers for the springs are included in
the X2 kit to maintain the same ride height as a stock balljoint, but with
a much improved roll center height. With the roll center restored to the
proper height, smaller front swaybars and softer springs can be used.
The result is a suspension that works for you to accommodate the small
and large imperfections that are in any road or track, allowing the tires to
stay planted on the ground where they belong.

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