the 2wd steering box is weaker, you should go with the 4x4 IFS box. also the steering shaft is a ball joint on 2wd, and U joint on 4wd. 4wd being stronger. also center bearing crossmember is differnt if u have 2 peice driveshaft. if u have any more questions let me kno. i just finished my 2wd transformation. oh ya. the rear axle lines up <img src="/forums/images/graemlins/kewl.gif" alt="" />