You can pickup the Aerostar springs at your local Autozone part# FCS 850V $65 for the pair average drop is 2"-2 1/2" no modifications needed just replace the old springs,if you change shocks while you are at it the Gabriel Gas shocks are part# 85026 they will probably have both in stock.These shocks are a little shorter than the OEM Motorcrafts so are a perfect match for the new springs,you will love the improved ride and handling.For even more info click on this:
http://www.jalopyjournal.com/forum/g...hp?groupid=332 put Aerostar springs in search and you will find tons of info,how to,and before and after pictures,while you are there join up and do an intro.