ok well i have barely been on this site but it has been extremely helpful. me and my wife are trying to go ahead and lower our 01 expedition xlt. we are trying to accomplish the lowest drop possible without going with air bags. I have had air ride before and thats not what i want. and im not trying to put that much money into it. I have found the DJM 4/4 drop and from the pic. it looks like exactly what i have been looking for.

now my question is. if i buy the lowering control arms. is it a MUST to buy the upper and lower control arms? or could i buy just the lower control arms and later buy the upper?? from what it seems is that the lower control arm is the one that changes everything not the upper. is this correct or am i missing something??

as for the rear would i just be installing new springs?nothing else is needed??thanx for any advice you guys it would be very helpful!!