Well on the way to work today I was still nervous about that transmission line so I was really paying attention and thought I felt something in the brakes. Then on the way home I was sure, and it sounded like the rears were grinding. But the pads and rotors were replaced not that long ago, maybe 5 k miles, so it couldn't be the pads I thought. Maybe the trans fluid got on them and they're glazed. But by the time I got home I was sure it was the pads gone. I pulled a wheel and sure though- the inside pads on both rears were metal on metal. It didn't look like the rotors were damaged so I bought some Wagner ceramic pads, the best that O'Reilly's had for my truck. Installed in a little over an hour. Now I'm wondering what happened- the EBC 7000 series pads were installed at the same time as the fronts, and when I did the GMT900 front upgrade a month or so ago, the fronts were at 80% still. In fact I sold those pads to a member here.I don't think it's the pads fault. I've always had good results and wear from the EBC's, and the fronts were wearing well. I'm thinking I may need new rear calipers. Anyway the last 2 days have been maintenance and more maintenance.