For my build i will be installing a 32v DOHC 4.6 and a 5 speed manual (not sure if that changes my options) but, for the rear end I have an 04 Ford explorer axle (3.73, limited slip, discs) The truck still has the stock leafs on it, Eaton said it would be about $375 for new springs in stock height or lowered to my liking. Since I will have to weld new perches onto the axle tubes I figured it would be best to just mount the axle on top of the springs and MAYBE notch the frame if needed. What would you recommend I do for the leafs if i go this route? Id hate to waste almost 400 bucks only to find out that the rear still sits too high or if i get a lowered pair the frame will need major surgery. Also, where is the best place to get spring perches?