I just picked up a set of 620 lb, 1 inch lowering springs from mustangs unlimited.  Installed the drivers side and was surprised when the springs don't fully seat on the upper arm and the shock tower.  True, the suspension is fully extended, but the difference between the stock spring size and the drop springs is 3 inches. makes me wonder how much drop there will really be.  Anyone have any experiance with this mod and the same thing I'm seeing?  

Didnt fully seat ??  You mean they went in without having to compress them? They slid on when the A arm is at full extension. Yes. Mine did also. But when you put it back down it returns to about stock height. I even had to cut out about a third of a coil to get the correct height I wanted. They certainly helped handling. I really enjoy them.  

I had to compress them a little to get them in. after I removed the spring compressor, they were loose. Thanks for the response.  

I also picked up a set of 620 coils along with a new set of 4 leaf springs. I installed the new rear springs and shocks last weekend. Are the front springs something I can do at home. How much is involved? Can it be be done with jack stands and a spring compressor. Does anyone know of a good HOW TO article? Or should I bring it to a shop? Thanks  

Well Arispoli, I kind of hesitate to tell anyone without some significant auto knowledge and tools to change the front springs. The reason is that those springs have to be compressed when removed and when you compress them they are like a cannon waiting to go off,,, very dangerous.  Its not a big job and you can do it with a spring compressor but the configuration requires an inside compressor with a lot of spacers so you cant just use one out of the rental shop, it has to be set up right. You can use an outside compressor but there isnt a lot of room so its a touchy job. If that spring lets go it can break your finger or your wrist or worse. So if your not entirely comfortable with it, get a shop to put them in for you. I been doing this a long time and believe me there is no shame in that at all if you havent got the right tools.  

How did you do it 1Hot ?  

Personally, I would never use an outside mount spring compressor. It's a real tight fit, and if it lets go, there's nothing holding it back.  I used an inside spring compressor, one that drops down the center of the spring. The best ones have hooks on the top that hook onto the spring and a plate on the bottom that slides into the spring and onto the threaded shaft of the compressor. It compresses the spring by turning the threaded shaft and drawing the two ends together. The compressor is tightened from the bottom instead of the top. Make sure the compressor has fine threads not coarse. Coarse threads strip out easier under pressure. I put the car on stands, removed the tires, and removed the shock absorbers.  Inserted the spring compressor and compressed the springs until they would come out. I would strongly suggest the purchase of a Chilton's or Haynes manual for instructions if you have never done this before.  If your unsure or have any doubts, pay to have it done or get the assistance of someone who's done it before. If the spring lets go while it's under tension, it's gonna be ugly.