So I have already went through all of this. The motor mounts are all the same doesnt matter if it is a 2.5, 2.8, or 3.4. They are all drop in the mounts. The fly wheels are diffrent and the wiring and fuel pump setup is diffrent. and the computers are diffrent. I switched mine out in less than 5 hours. The switch is really easy. And the hourse power gain is worth the time to switch.