When lifted, the stock front driveshaft life span is considerable reduced. Expect a life of 25-30,000 miles. The Superlift replacement shaft is a more "lift friendly" dual cardan design.
The Superlift 4" lift kit for the Ford Explorer Sport Trac includes lifted knuckles, differential brackets, crossmembers, compression stop bracket, torsion bar bracket, brake hose relocation bracket, sway bar drop link, rear leaf springs with bushings and u-bolts and 4 Superide shocks. Shock boots sold separately.