[cbreez]

The rear springs adjust similar to the front, adjustment spanner nut on top of the spring. Use a spanner wrench or large channel locks. Disconnect the rear shock first to let the control arm drop a bit.

BTW, unless your tires are rubbing the body, you don't need to jack these cars up much at all. The suspension travel is minimal so you don't need the car up in the air. If you adjust too much, you will ruin your alignment so be careful.

If you are driving in and over craters, not much will help.