I'm putting my 4406 in after work and im getting ready to figure out drive shafts. I've been reading a lot of 2nd gen explorers used 98-03 f150 4.6 front shafts. So I think thats what I need as the sport trac uses the same (06/2001 sport trac) Then I see to get a 5.4 expidetion rear shaft i think also 98-03 but they are too short for the sport trac. making me think, i just need both shafts from a 98-03 f150, just need to figure out cab and bed length. my 4406 is out a 2004 new body style f150 if that changes anything.