Chrysler Repair: Front end shimmy, engine oil pan, snail mail

Question
Hi,
It is a 91 LeBaron 4dr sedan 3.3 V6
Just to make sure you understand, it doesn't just vibrate or shake, it seems to wobble the whole front end. I did have it on jack stands and in gear and the tires or axles didn't seem to wobble and when I rev the engine it doesn't seem to move in the mounts but maybe I should jack the engine and see if it moves in the mounts as I jack it, but then again maybe I should just wait for you to tell me what to do instead.
Thanks a lot for getting back so quickly,
Tom
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Followup To
Question -
The front end shimmies dramatically under acceleration only, as soon as you let off it smooths out completely, but any acceleration at all causes a shimmy almost to great to drive.
Answer -
Hello Tom,
I suspect that the reason for you shimmy is that one or more of the three rubber damped engine mounts is worn out so that the engine shakes when it is asked to put out power. When the engine tries to put torque on the wheels the structure of the engine has to respond by putting torque on the chassis via the engine mounts. When these wear out the engine will vibrate in the worn mounts. Fortunately it is not an expensive repair to replace the worn mounts. If you have a floor jack to support the engine and some wrenches you can do-it-yourself. Let me know what year and engine you have and I may be able to send you via snail mail a page or two that shows you the mounts and the steps for replacing the worn ones.
Roland  

Answer
Hi Tom,
Here is the instruction from the Haynes on how to check the mounts:
The engine must be raised slightly to remove the weight from the mounts:
Raise the vehicle and support it on jackstands, then position the floor jack under the engine oil pan. Place a large block of wood between the jack head and the oil pan, then carefully raise the engine just enough to take the weight off the mounts.
Check the mounts to see if the rubber is cracked, hardened or separated from the metal plates. sometimes the rubber will split right down the center. I believe you will find three mounts (two on the engine, one on the trans)
Check the relative movement between the mount plates and the engine or frame (use a large screwdriver or pry bar to attempt to move the mounts). If movement is noted, lower the engine and tighten the mount fasteners.
To replace a mount, remove the negative battery cable. With the engine still supported on jackstands, remove the nuts holding the insulator to the engine bracket. From underneath remove the nuts holding the insultor to the frame.
Raise the engine with a jack and block of wood under the oil pan until the studs clear the engine bracket and the frame, remove the insulator and replace it with a new one. Lower the engine and replace the nuts on top and bottom.
Tighten nuts to 45 foot-pounds.
If the mounts seem o.k., then another possibility is one or more of the cv-joint boots may be leaking its grease which has resulted in a failure of the joint itself. So take a look at those, 2 on each half-axle. But usually these make a noise when moving around a turn and not while going forward (early in the history of a leak) though they could vibrate when going forward if the joint gets damaged and is under torque conditions (as when accelerating or decelerating.)
Roland