I have replaced the two main drive shafts, rebalanced the tires (several times), replaced the steering damper. The vibration seems to be less when the gas tank is full...but still there. Under acceleration tit is less and increases when the weight is transferred to the front when letting off the gas???

Then the speedometer goes to zero instantly and stops working and the brake light and the ABS light come on and the car runs great. What could that be?