Way OT 92 Deville bad rear end vibration

I am sure someone has seen what I am dealing with. When you are doing under 20 the rear end whips side to side several inches. At speeds above 55 there is vibration bad enough the whole car shakes. I had the rear end jacked up last weekend and didn"t see anything obvious. Over the last week it has gotten worse. The rear tires are worn but are uniform. Any ideas what could be doing this? Can"t drive it if it gets much worse. Thanks
 
(quoted from post at 09:39:05 03/17/13) I am sure someone has seen what I am dealing with. When you are doing under 20 the rear end whips side to side several inches. At speeds above 55 there is vibration bad enough the whole car shakes. I had the rear end jacked up last weekend and didn"t see anything obvious. Over the last week it has gotten worse. The rear tires are worn but are uniform. Any ideas what could be doing this? Can"t drive it if it gets much worse. Thanks
BAD BELTS IN A TIRE! Get it attended to.
 
most common is bad radial tire--had one do that a while back, usually i can feel around tire & find where the treadline twists, but had to remove these & roll & look carefully-
 
It sounds like you have a tire with a slipped belt. Have some one drive the car real slow and watch the rear tires. If they have a bad belt they will look like an "S" kind of, just not that sharp of curves. It will make the car shake side to side and vibrate very bad at higher speeds.
 
I have a 93' Deville that is about the same. The design of the rear suspension is very poor especially the air ride. Cadillac immediately turned their back on buyers as far as any support. Quite likely you have a very bad rear wheel bearing/hub assembly (these go bad really fast) and are spendy to replace. aside from that depending on where the car has spent most of It's life, probably the frame, trailing arms and strut towers are rotted out to the point that something is letting loose or has already failed. I took mine off the road for those reasons.
 
Like the others said; bad rear tire. Jack it up and turn the tires by hand and you'll find it. I would put gloves on to turn the tires, you won't jag your hand so badly that way! Very common problem now-a-days.
 
Seen that happen many times on many cars and trucks. I would start with looking at the tires, then the rims then wheel bearings and then maybe suspension
 
An old rule of thumb is any thing under 45mph it's the tires or the rims, any thing over 45mph it's balance problem.

To me it sounds like you have a tire that's separated or a bad bent rim.

If it's rear wheel drive take a look at the drive shaft for a wobble or bad u-joint.
 

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