OHHH! NOW I feel better. Sorry for not figuring that out.
Here's probably the most important clue:
"Then the shaking continues if you shift from reverse to neutral."
The transmission is out of the picture when you're in neutral, so until we know differently, lets forget about looking at that. What IS changing is the engine's position. It is normal for it to rock when shifting directions. One of the engine mounts is responsible for controlling how much it can rock, and how much it can move during acceleration. Based on the way you can get it to shake and stop, it sounds like you have a collapsed or deteriorated engine mount. All of them are two-piece metal brackets with rubber isolators in between. When that rubber tears or crumbles, the two metal parts can touch each other. That will transmit normal engine vibration into the body where you will feel it, and it can be real irritating.
If I'm right, you may be able to see the excessive engine rocking by putting the transmission in "park", then open the hood and watch how much it rocks when you push and pull on the car by hand. If it's really bad, you'll even hear the metallic clunk of the two brackets hitting each other.
Another pair of engine mounts hold up each end of the engine / transmission assembly. A collapsed mount will let that end drop down. You may get a vibration in the steering wheel when you accelerate, but mostly you'll just get that irritating vibration in the car again from the two metal parts touching each other. On some cars it's real easy to see when one side of the engine is sitting low. Some are hard to tell except by mechanics who are real familiar with that model and engine size.
Sunday, January 26th, 2014 AT 12:18 PM