Your mate will end up needing an extra cab tub rather than single cab unless you are planning on lengthning his chassis. As for you, you will need to cut about 280mm out of your 2wd chassis. You'll also need to swap the six tray mounts and body mounts over from each chassis. Your fuel tank is another issue as the std 2wd tank won't fit under the runner body. Needs to be speced down and then your tank will hang past your chassis rails.