A couple of days ago i took a couple of hard launches. Now, everytime i am in 2nd gear and above i have a bad vibration. It is very noticable when you are riding in the car. I was thinking maybe one of the weights fell off of one of my wheels but all of the weights are there. Does anybody have an idea of what else it could be?

driveshaft

its possible you bent something, driveshaft, torque arm.

find an ls1 driveshaft with a dampener