I started getting an intermittent rubbing noise timed to the driveshaft motion, so I crawled underneath and sure enough one of the parking brake cables is contacting the shaft when it's released. There is a lot of slack in the cables when released, and it's kind of looping around at hitting the driveshaft. Is it normal for the parking brake cable to have a lot of slack? Any idea how to take up some of it so it doesn't rub? It doesn't look like the adjusting bolt on the rocker arm thing where the cables meet would do enough to matter.