vibrating when deaccelerating after accelerating to speeds 60 to 70 mph
Likely a bad hydraulic engine mount.
Are you using the brakes at the time? If so, it could be a warped rotor.
Not when braking, vibration occurs when accelerating to 55-70mph and letting off , if you shift to neutral the vibration goes away
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Could also be something between the transmission and the wheels. Does this vehicle have AWD?
That was my thought too, especially since the vibration goes away in neutral. Maybe a bad CV joint?