It's so easy it isn't funny!
All you need are longer bolts, the lower the spring ends are the lower the car sits. I just went to the Bolt King and got some longer grade 8(?) bolts. Cost me about $4
Jack up the spring to loosen the bolts. Fix a "G" clamp (with some wood to protect the spring) to the spring to stop the jack from slipping, pull the old one out and slip the new one in. Do the same for the other side. Simple as that!
Measure the height difference between the outer end of your halfshaft to the inner. The difference should be around 1/2 an inch (the inner must sit higher than the outer uni joint).
I drilled a hole at the end of the thread to insert a split pin for peace of mind.
Here's a link to an old post -
Post 84Cheers