Vibration at acceleration problem in a 99GT?

188slo50

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I have a vibration while im accelerating and not exactly sure where to look for it anymore. It does it around 50mph or so and just cruising down the road If I accelerate hard its not there and if I left off the throttle it goes away aswell. Its not really in the steering anymore than I can feel it in my but which is why it has me stumped. I checked my U joints which where fine and I have new tires. I was wandering could it be in the rear like the pinion bearing or maybe a motor mount?
 
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188slo50

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It does it from around 45-60mph. If I hit a dip in the road and the car gets a little air the vibration goes away untill the car gets all it weight back on it. Whats the chances that it could be coming from the trans, it is an AODE car?
 

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