Okay so ive redone the entire tutorial from scratch. I finally got all the coding to work this time, however, the rear wheels seem to rotate on a completely different pivot, so the wheels spin through the air at 50,000rpm or something ridiculous.
The same has happened to the front wheels, they turn on a different axis. Ive checked the physics set up in UDK and the bone structure seems to be of been shrunk in UDK for some reason? My bone system in Max was placed exactly on the wheels, axles etc, so im not sure what the hell has gone on.
Apart from that, the car works perfectly