My 64 Sedan De Ville has a vibration starting at 20 and stops at 25 to 30 mph before that and after that car runs smooth. Thinking it might be an exhaust vibration I put a little sill glide silicone on the rubber hangers which are only 10 years old and in very good condition. This did not help. There is no vibration when car idles or when I rev it up. The car runs and shifts great. I have just recently noticed this vibration. I have owned this car for over 10 years I bought it with 18000 miles which really are original and now have 21000+ miles on it. The condition of this car is mint inside and out point being it's not beat. It's all original, I have done a lot of mechanical things but have never touched the drivetrain. Any thoughts would be much appreciated. Thank you, Ron Perry, the only other thing I might add is the vibration seems to be coming from drivers' side, but it is really hard to determine.

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It could be a few things. Probably the most common cause is drive line angle. The angle shifts when motor mounts, especially the transmission mount collapse. This discussion comes up often. You can use the search function (upper right-hand corner of this page) for search terms like "drive line angle" or "rumble" etc to see previous discussions. I'd check the condition of the transmission mount & go from there.

Ron 
All parts associated with the rear axel - control arm bushings - shocks —  the ball joint above the rear  end housing and the bearings at the middle of the driveshaft could add to the vibration and  should be inspected for wear 

Worn rubber there causes the rear ( with the gears ) to shift its location when going and stopping  

In Videos —-there is a video showing this happening 

Kurt’s suggestion of motor and trans mounts 

The back trans mount can flatten and change the drivetrains angle to the trans 

A worn rear bearing in the trans has been an issue in the past but not often 

A lot of things effect the drive shafts —angle of dangle —making it a complicated trouble shooting issue 

Sometimes letting the problem get worse makes it easier to  be identifying the problem 

My Dad use to say “ turn up the radio and when it breaks you will know what it is - LOL !   and no one more of a car guy than my Dad was 

With only 20,000 true miles ( but 50 plus years old ) on your Cadillac it seems odd to have this issue unless the rubber parts have gone bad from age 

Look everything over looking mostly for rubber gone bad from age 

The rear trans mount going flat and the driveshafts center bearing could be a part of the issue 

The extensive number of things that can cause the problem is part of the problem 

I do feel your pain - as I hate car vibrations of any kind myself — especially in my favorite Cadillac 

You might have a shop inspect the parts suggested above  ——and give you an estimate as they will be happy to let you know what you need —-thinking they will  possibly be doing the job for you 

There feed back could give you the locations you need to be focusing on if you can do some of the work yourself 

Hope that helps some 

Enjoy 

This is a great post.  I get a noticeable vibration at about 40 mph which stops at about 44 mph. I've had my mechanic look it over a number of times and we have been unable to locate it source of the vibration.  My mechanic has suggested that, although my tires are in great condition, they are quite old (2009), which suggests the car had been sitting for quite a while, and seems to have produced a very slight bulge in the tire from where it sat.  Once my car gets out of the paint shop, I'll be putting new tires on her. I hope that cures the problem. If not, I'll be having my mechanic inspect the drive train and rubber.

I want to thank everyone for all the great replies to my post. All of your information has been very helpful. I did look at all my rubber components first based on cars condition and age seems the most logical place to start. I did notice some fine cracks on the transmission mount, but engine mounts look ok. I also looked as best I could at the rubber bushings at the rear of car and did not see any noticeable cracks. My tires are over 10 years old, but tread is excellent so that's another spot for me to look. I have my work cut out for me! Thanks again to everyone Ron Perry

New tires —balanced will do wonders for the cars ride 

A good first place to start especially as you know they have years on them already 

Sitting causes flat spots that can mess up your smooth ride

 The thing with sitting and little car use  is that the tire thread is still newish  looking but the tires are just old at some point and need to be replaced 

Usually a tire is evaluated by its tread wear but not for Classics cars that sit 

Enjoy 

Starting front to rear; Collapsed trans mount, worn tail shaft bushing, bad carrier bearing or support, worn CV joints, worn bushings in the lower control arm. ( the rear bushing gets distorted and allows the pinion angle to change) Unbalanced drive shaft.  Bad rims/tires, 

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