Only way I know of to get into the brains of it though. Autothority would probably be a couple bones cheaper. I don't know how much more useable speed he's gonna get though. I owned a Tundra and I wouldn't want to drive it any faster than it was governed.
Slow Down and enjoy the drive fellows, unichip can fix that issue and they have a PNP chip for Tundra. 105 MPH is probably way tooo fast unless you have upgraded speed rated tires and then it is still too fast!! FYI Arizona DPS has been cracking down all over state for speeding so beware!!
on some vehicles, I'm not saying that it will work for sure on the tundra......all you have to do is pull the E-brake one click and it shuts off the governor