Ok i have a eb falcon auto on duel fuel and the other day it got in after getting to a job and had to go to another when i turned the key on my temp gauge shot up to hot, i popped the bonnet and found trans fluid in my reservoir for the radiator (looked like a chocolate thick shake). Whats the best solution for this problem??

Change the radiator, your trans cooler in the side of the radiator has a hole in it and you probably will get or already have water in the transmission. Or you can bypass the radiator trans cooler by fitting a good sized air cooled tansmission cooler.

Do it sooner than later.