Your audit number is a 11 to 20 digit number most often found towards the bottom of your driver license. In some instances it can be found vertically next to your picture.
The state requires your audit number in order to process your driving record
Why do you need the last 4 digits of my social?
The State of Texas requires us to collect the last 4 digits of your social to submit to them to verify you are indeed the person requesting your driving record.