Is the transmission the same for a 4x4 and 2wd ford f350 dualley 1999?

Is the transmission the same for a 4x4 and 2wd ford f350 dualley 1999? - 1

Nope

Not at all, the 4x4 would need a transfer case and all sorts of other parts to make it work. It would require a donor truck to make that happen at a cost effective rate.

Yes and no. The internals of the transmission are identical, except for the output shaft, and the rear of the case is different, so the transfer case bolts on.