Toddbrandon28

2000 1500 I have just replace spider gears it's a 3:42 btw but when I had it tore down I went a head and changed the rear brakes no the drums just the pads it's been fine for the past couple weeks but now at low speeds when I hit the brakes it try's to lock up in the back and makes a grinding noise any ideas when I get home from work I will be pull tires and checking it out