I was driving and I had 4 people in the car (including myself), total weight was probably around 450 pounds or so (one of them was a child). I'm driving back to my house and all the sudden it got really hard to shift. It slipped into first with no problems, but 2-5 were a bitch. There's a lot of resistance in the shifter itself, even with everyone out of the car. I removed the plastic piece but I didn't see any obstructions. FYI It's a short throw. What happened?