apdac04

Hi all, My 04 Pathfinder transmission lost its reverse and grinds when accelerating at times, so I'm assuming its going out... Planning to replace it myself and my neighbor knows a guy with a couple 01 pathfinders with good trannies. Wondering if an 01 tranny would fit in an 04 pathfinder. My 04 is 4wd and not sure if his 01s are 4 or 2wd. If those trannies bolt up and he has 2wd pathys, would that still work in my 04 4wd? Thanks in advance.