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Yes, there have been several people who have installed just the Roush rear springs including myself. It will lower the rear of the car about 3/4 to an inch. It is well worth it in my book as the car looks more level.
i have had my roush springs on for almost a year. pretty sure i didnt get an alignment an i've noticed no uneven wear. Levels the car out nicely, i am actually looking for some front springs now.
the axle may shift 1/4" toward the drivers
side. now, whether that brings the axle
closer or further away from dead center,
will depend on the position from the factory.
I am doing Roush rear's soon as well. I want to get rid of the wheel gap. I lowered my last car and it was too much of a compromise in street driving. I hated speed bumps and big inclines. I figure 3/4" in the rear wont affect overal ground clearance much.
I also have adj LCA's and Panhard that I am going to have a pro do the adjustments. I will post pics when it is done.