Thanks for the help though and I will do!!!

 

***Update***

I just put some air in my front tires and now the shaking is noticed at 35 - 40 mph instead of the start of 50 and above. What could it be? Any ideas!!!

 

I have been having a very similar problem. I have an 04 Imitimator I bought used. I have replaced the motor mounts, tires (had them balanced 3 times including road force), had the transmission tested to see if the torque converter was bad (no luck there), and I still get a vibration that start exactly at 50 mph upon acceleration. The severity of the vibration varies but it seems to do worse when it's cold. When I pull in my driveway I do sometimes hear a small "thump" from the front driver side area, but I have had 3 different mechanics inspect the car. They say that everythign is tight and they don't hear any noise in the wheel bearings. The car rides beautifully up to 50 and then just pi$$es me off. LOL. Can anyone give me the standard ride height for this model? The car was driven pretty hard before I bought it so I'm thinking some young punk owned it. Possible lowered the front incorrectly and not back (back seems slightly elevated) and didnt' replace with the shorter dog bones. I'm pulling as straws (as you can see) so any suggestions would be greatly appreciated. Sorry for the longwindedness, but I'm at my wits end with this.