I just got my new 347 in and ever since I put it in I have had a major vibration in my shifter I notice it the most when I am getting on it at high rpms the motor is balanced and it runs great but this vibration was not there before I put the new motor in I dont realy feel it when i am stoped and in netural and i rev the motor.When I get at high speeds and it starts vibrating real bad I can push the clutch in and it still continues to vibrate.