Thiking about getting into autocross

Ok i am considering putting my 93 t/a show car into autocross..

what i need to know is what is gear i figure 3.23-3.73 which is it, and how much money it take? what all parts you need

Go to: http://www.scca.com/ and find your region.
Depending on area, it's usually around $35.00 to run and you'll need a helmet.
You don't NEED anything else to start, just take your car out and do it.
Read the rules and figure out what class you want to run. It will become clear what you'll want to do after that.