Normally, it would be as the 4WD unit is a separate box, but the box needs to bolt up clean against the new one... so it may not work because the tail-shaft will be different.
no. the 4wd output shaft goes into the transfer box. The 2WD straight to the propshaft. Most parts not interchangable
not with out taking the transmissions apart and changing the output shafts. so can't interchange