I had mine dropped 4" by "MOR-DROP" in Oakland Calif. The ol guy's been doing axles since the late '50s.
I had him also fit the new king pins for me,,I think it was an xtra 90.00 or something like that.
Your 5 lug hubs and drums will fit right back on as before.
I DID have to turn the tie rod upside down to clear the oil pan,,other than that,,everything went back together no probs.