I didn't even know there was an internet presale this early (usually it's the day before tickets go on sale IIRC), but I just found out and the password for the WWE sale is DANNYJ. Hope this helped and that this hasn't already been announced here, I looked but didn't find such a thread. Go to fordfield.com and click on the WM23 logo. It's supposed to end at 10:OO PM tonight.
It looks like to say that he is joining the pit crew is a little bit misleading. Sounds more like he is just going to hang out at Biffle's pit area for this particular race (and I'm guessing film some stuff for his TV show).