wheels turn in opposite directions... :-( please help!

when the front wheels turn forward, the rear wheels turn the opposite direction. what is the problem?

i purchase the FLM front combo bulkhead and is it possible for me to put the gears in backwards? when i assembled everything, it all went together so smoothly. i didn't think anything was wrong until i finished my build and went out for a test. is it possible that i somehow damaged my tranny?