Car sim help (Tried to mimick Erwin's demo)

So just for fun, I wanted to mimick that car demo in the Blender 2.42 physics demos. I gave 'er a shot but ended up with a ton of problems. Here’s the blend, so if you’re kind enough to let me know what I did wrong, that would be awesome.
http://www.savefile.com/files/169820

I tried to copy the demo as exactly as possible but when I hit P, nothing happens and then in 2 seconds, Blender crashes.

Thanks!

According to the terminal readout (or what ever it’s called):

PYTHON SCRIPT ERROR:
Traceback (most recent call last):
File “vehicle”, line 35, in ?
AttributeError: Unable to find requested actuator

I’ve got it to work i’m just uploading it to save file, just wait a sec.

Nice truck by the way

Here is the file:

http://savefile.com/files/178575