Well i get into my car and start driving as normal, but once I throw it in Reverse (Auto tranny ) it makes the wierdest shake, as if it is at low rpms, but the rpms remain the same as if I was in D or P (900rpm ). I throw it in drive and acts normal, but as it gets into reverse it will shake severly, but rpms will not drop! I have no I idea what it could be! help please

 

NVM close thread, found a wrench wrapped around my axle, dont ask how it got there.