When I accelerate quickly I feel a thunk under the left wheel (both tires only once). I am told that I have too much torque/hp for the rear to handle and the yolk is being forced upward into the body. If this is true then how come I only hear it on one side?One other thing I was told is the posi-traction may be catching on one end and the noise I get is from the other finally getting planted. I know this can't be good, but how long before it goes?