Hi everybody, I would have your opinion on this I got a explorer sport 2001 4.0 4x4 automatic that has a roolover but mechanicaly correct I would like to know if it worth it to swap the mecanic into a blown engine or transmission one and if yes in wish model that gonna fit "easily" ranger, explorer, mazda b-series with 4.0 I imagine but feel free to correct me if i'm wrong. and how tought it is to put the 4x4 in a 2x4 vehicule

thank you all