So I just finished a trip from MS to Cali in my 4runner. So before I left I noticed the back brakes would make this light chirp as the wheel turned. It didn't change whether I was applying the brakes or not. So during the trip that chirp became more of a slight grind and chirp. So I parked on a hill at the hotel and set my parking brake. The parking brake has never worked it just clicks all the way to the floor. So I left it on regardless. Now the next morning I get it up to 85 and begin hearing this clicking noise inside the vehicle. It's basically inside the gearshift. Now some how I narrowed it down to when you hit the parking brake it changes the the tone and almost stops the click completely. My question is what kinda problems could I be looking at here? 2006 V6 2wd 168k mi