Originally Posted by hydrope
If I were you, I would try to stay off of I-35 from Hillsboro to Austin. It is under construction in many places, traffic is very heavy with lots of trucks. Just one small accident can cause a 10 mile backup. We live in Waco and see, or hear about 2 or 3 wrecks and delays a day. Routing around this section is not easy, but look at your maps and just try to go around it. Have a safe trip.
I've done Hillsboro to Austin several times pulling the 327 and he's right it's a several beer when you get there trip.
Yeah, 77 out of Waco isn't bad at all. It will take you all the way there it is mostly 2 lane if I remember correctly.
Also, you can take 281 from about FTW to San Antonio.