No good vibrations

[00BlueSamy]

So I have a 2000 5.0 Limited with 225000 miles and she has Parkinson's. She vibrates all the time is it more noticeable around 1000 to 1200 rpm. I know there is a oil leak in the rear main seal. I thought it could be a motor mount but the vibration is still there when I am power braking to see how much the motor move. (the motor doesn't move very much). Any other ideas?

 

[Celeborn]

I've had two 1997 Mercury Mountaineer 5.0s, both have vibrated somewhat noticeably.