im getting a real bad vibration when im accelerating past 40, or if im getting on it. i replaced the drive shaft, brakes, sway bars, added a strut bar and aftermarket wheels(17's). any ideas?

 

does it happen at a rpm range? could be clutch buzz. Its the pressure plate that causes it. I have an AP1 with that issue, but usually when I let go of the gas at around 3-4RPM. I can hear it usually when i down shift.