The other possibility is that Rancho makes their Quicklift strut/spring assemblies to fit 06-10 Explorers. This would only get you about 1.5" of lift assuming they will actually fit the Sport Trac. Unless you add a body lift that is about the limit for our front suspension due to the upper control arm design and the rear suspension due to the fact that the IRS halfshafts pass through a window in the frame rails. Unfortunately, I have not been able to find out yet if they will fit a Sport Trac. Retailers' websites do not list them for ST's, only Explorers and Mountaineers. My guess is that there is something different about our rear suspension, either the upper spring mount or the slot in the frame rails or a higher rate spring or?