[Dalaigh]

I'm trying to find out if or what the width difference is between a 2wd 14b ff and a 4x4 14b ff? I'm looking for a 14b ff for my truck and I keep finding 2wd trucks and axles but not many 4x4 trucks. And I would like to know if the 2wd is the same width or not? Thanx ahead if someone can help me.
Steve