dropping a 98 ranger.

I wanna lower my wifes truck it is a 98 ranger. I wanna go about 3-4. I saw some springs on EBAY for twenty something. plus shipping. Will I need control arms? is the camber gonna wear out tires on the newer model rangers? I will take it and have it aligned after wards. I just don't want to for out the money for control arms for the wifes truck. Also, how much will the flip kit give me in the back? I wanna be able to put some polished 17 or 18 inch mustang rims on it. and make it look good