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Found this on a different site. Haven't seen this mentioned on any thread about coilover installs, but maybe this is more for alignment techs:
"Relieving Bushing Preload
I’m sure you thought you were done with the install right? There is one more thing you must do to achieve the complete 1” drop from your new springs. From factory the suspension arms are torqued down at specific angles in order for the control arm bushings to operate with the least amount of stress and bind. When you lower the vehicle, the inner bushings on the lower control arm should be reset so there is no preload in the bushings. Preload can alter ride height and cause your car to be higher than intended.
1. There are basically two bolts to worry about. Let’s talk about the front end first. The lower control arm has 2 inner mounting bushings. The front bushing is a horizontal style bushing and does not require any preload resetting. The rear bushings are a normal hinge type bushing and this is the bushing that will require resetting. Loosen this bolt on both arms. Do not remove, just loosen a few turns to relieve the preload. At this time, do not tighten these bolts. (17mm socket & wrench)
2. For the rear, there are two control arms to be concerned about. The lower lateral control arm and the diagonal link. The inner pivot bolt on the lower lateral control arm should be loose if you followed step 20R. If not, loosen this bolt, but do not remove. The outer bolt on the lower lateral control arm is attached to a ball joint type joint, so it does not build up preload. Do not worry about the upper control arm. The diagonal link will need to have both ends loosened. Again, do not remove these bolts. Only loosen. (17mm socket & wrench) The next step will require an alignment rack (preferable) or floor ramps. With all of the bolts discussed loosened, lower the car back on the ground and roll the car about 10 feet back and forth. Drive up onto the alignment rack or floor ramps and tighten up all of the bolts. The point of this exercise is to tighten up the bolts with the suspension arms at the new lower ride height angles."
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