02ttop

i have a 02 trans am ls1 with a auto , when in park a can rev the car right around 2300 rpm's and i get a vibration thru the floor and center console and drive it about 65mph and get the same vibration when driving about 65mph if i put the car in neutral it gets worse i can turn the car off at 65mph and the vibration is still there anyone have any ideals please help . I am starting to belive the trans itself is bad input or output shaft i have know idea i am lost lol.

list of new parts complete new rear , u-joints , motor mounts , trans mount, tourque converter, tourque arm mount is also good and flex plate is good .

SladeX

edit:
nevermind, you said it happens in neutral, so I'd go with motor mounts, rev the engine from the outside using the throttle body and check for excessive movement of the engine

02ttop

i replaced the motor mounts 2 days ago still the same