Frustration AutoXing an Automatic 4th Gen.

So I got my '94 TA up and running and decided to take it to a local auto cross to get some seat time. The car happens to have a 4L60E automatic trans. I never autocrossed with an automatic before but figured it wouldn't be a big deal. There is one less pedal after all. Boy was I wrong. First of all the shifter only goes down to "2" on this car. There's no option to lock it into first gear which would have been ideal because it was a small course. Secondly, by leaving it in any of the other gear settings it has a nasty habit of downshifting into first about half way through my corner exit and making me go into massive oversteer. I figured it would have stayed in the gear I selected ie 2nd.

My question is this: What can I do to either lock the car into a gear or be able to shift into first on demand with the shifter to add predictability? Any advice would be appreciated.

Matt

New Here with a Grassroots Challenge car

Well like the title says I'm new on the board but that's not to say that I haven't been lurking for a while. I just aquired a '94 Trans Am that will be used to compete in the Grassroots Motorsports Magazine $2010 Challenge. This will be the second car I've competed with in this venue. The first car was a fox Mustang that finished a best of fifth in 2006. I've been autocrossing for more than a decade but this is the first F-Body I've owned. I promise to search this board thoroughly before I post up any tech questions. Look for me to post a lot in the classified sections looking for cheap parts to keep me under my budget limit. Thanks in advance for all the help.

Matt