I have taken extensive suspension measurements/observations and can make the following comments.
I measured a set of Roush Cougar rr springs before install, calculated the rates and they are not stiffer than the stock early SE springs. As I recall, the rates are almost equivalent to SVT springs (don't have the data handy). They are shorter at free height, lowering the car when installed.
Also, if you look at the lateral rr control arms they are NOT level at standard ride height (at least not my Contour). They are higher at the subframe mount/lower at the knuckle. This is with an unloaded vehicle using (relatively new) stock early SE springs. Now the front A arms are much closer to being level at stock ride height.
The absolute best geometry would be with all arms/links level with the car loaded with it's normal passeneger load, fluids and 1/2 tank of gas.
Redcoat Raceworks. Performance parts and custom fabricating for Contours, Mystiques and Cougars. Specializing in chassis and suspension parts. Custom end links, control arms, strut tower bars, engine torque braces, etc.
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