I have a 99 cherokee and a 91 i want to take the dash out of the 99 and put it in the 91 is this possiable and also im thinking about takeing the doors and gate off the 99 and put them on the 91 and agian is this possiable? any help would be nice.

 

The door swap would require modification to the hinges, and that's if the doors will swap in the first place.

 

the liftgate i dont think is possible. the doors and dash yes. i am actually in the process of stripping the interior out of a 99 and putting into an 88 mj

 

The door will also require moving the striker. It's also a different type of striker on the '91 & '99.
The lift gate on the '91 has external hinges that mount to the roof. The '99 has internal hinges.
There was a body update change in '97. The parts all look the same on the outside, but it's the internal changes that make it difficult to use '96 down parts on '97 up Cherokees.