im building a monster truck and i want independantly controlled rear steering like a full size mt. I have a dx3e is there a way i can set it up with the aux switch to run this? I know i can do 2 and 3 position but i need it to re-center from turning left or right. Help?

The DX3E will not do independent front/rear steering. It will do mixing of the steering channel and the aux channel. To do full independent front and rear steering, you need a 3-4 channel stick radio. Now that DSM is so popular, you can use a air DSM radio for ground applications. There are plenty of manufacturers, with lots of radios to choose from.

Here is a descent one.

2.4 CT6B 6 Channel Radio