The stadium upgrades a few years ago caused parking to be scarce and expensive. Be prepared to pay $40 to park anywhere close. The best place to park is Paschal High School on Berry Street east of the campus. 3001 Forest Park Blvd. It's $15.00 and TCU provides you a shuttle straight to the gate. Then you have an hour after the game to get back to your car. It is BY FAR the best way to get there.
There is a lot of construction on and around Interstate 30 and University (new Tollroad). That is not the way to approach TCU right now. Use I-35 to Berry and make your way in from the east.
My advice is to just avoid approaching from the north.
That's my two cents hope that helps. Enjoy.