Chad is correct with the preload of the rear. Though it takes a lil more work, it's to ensure that you have the best setting since the OEM rears make it slightly more difficult to adjust than the True Coilovers in the front.
What we usually do is:
1. Adjust the rear springs to the desired height
2. Install the rear shocks onto the bottom mount with the shock body lowered all the way, leaving the top mount free
3. Jack the bottom spring bucket up so that the springs are just about LOADED correctly (still able to turn by bare hand with the top of the springs flat against the top Gold perch/collar)
4. Starting to adjust the shock body and slowly raise it up so that the top mount will align and bolt up correctly with the 2 top bolt.
5. Bolt down everything and lock all the perches/collars.
6. Drop the jack and the springs should sit snug still
That should be the "base" preloading. Test drive, then readjusting the setting accordingly to how the car response
