I have a 2003 grizzly 660 all parts work but I have a 2007 grizzly 700 engine, shafts,diffs,etc and I am curious. The question is how hard would it be to put the 700 engine into the 660 frame? What would need done to make it work? Not looking to hear that it’s not worth the time. Has anyone done this before? I can’t seem to find out if anyone has. I know it is possible with the proper equipment and the time but I want to know what will need done.