Outer Limits 4x4 Board

Ok heres the idea i have a gq with a 4.2 td in it now and we also have a 4.5 petrol gu that my wife has been driving, she dosent really want to any more and wants a commodore.The idea i have is to put my motor and box into the gu and was wondering if anyone has done this on here and what sort of issue they had. I know it can be done but it might not be as simple as i think it is and i might not be thinking of all the things that would need to changed etc.Any advice or hints would be great also any links from here or other website would be helpful

thanks in advance.