The only vibration I feel is just before I hit the traps. But I am thinking it is just suspension/wheel balance... ?
I am about to pull the driveshaft, I will check to see if it bottoms out, but I am not sure I understand the play?
...Also, I was foot braking the car and held it back to around 3200-3300 rpm and then would launch the car. Think maybe I torqued it too much and it broke that way?