BFarrier

so i put 456 gears in a month ago and now when i get on the brakes there is like a chattering sound and sometimes i can feel it in the car idk if its in my rear-end or maybe a loose caliper? any advice or if anyone has had this happen let me know im going to pull and investigate now the rear of car. i will also post this under the brake section to see if its the brakes at all.... thanks guys