My '64 convertible is an excellent example and drives beautifully, EXCEPT that it bounces on bumps, especially, say, a speed bump where it will go up and down 3 times and jiggle before settling. I replaced the shocks, and surprised that it made no difference. I have read through the "suspension" help area and it tells what to do but not how to diagnose. I assume I need new springs and have no idea when mine might have ever been replaced, as I've had the car two years. Shall I assume this will fix my problem, and is there anything special to know before I order something? i see Caddydaddy has them for $300 or so per pair. I would think many aftermarket springs could work, wonder if these are special?

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Where are you located ? I’ve just replaced the whole suspension in my Cadillacs and have some new and old coil springs

I'm in Darien, CT near New York city.

Sounds like a shock absorber problem to me.

Unless its too low or too high in ride height, buy some quality shocks for it.

Yes, I replaced the shocks, there was no change. It was done by the Volo Auto Museum in Chicago, where I bought the car.

Preston

I think your problem would be shocks all around - ( they keep the tires tracking on the ground preventing wheel hop and suppression travel ) front and rear bushings and a complete front end exam which would include ball joints if worn 

If you push down each corner of the car the car should lift and settle at the height you started  as a sign the shocks are working

As the shocks are new the other suspension components become the issue 

The rest of the problem would be worn  suspension parts 

If you are considering replacing the rear end control arm bushing let me know as there is a serious issue with obtaining those bushings on the current market as who ever you purchase them from( only one supplier regardless of source )  they will be very short lived - 600 miles 

Dan McNarry —( under  part Suppliers in the  header ) makes new replacement arms with bushings on here which is the best and only real  solution at this point in time for that 

You may still need springs but you have to be sure your basic suspension issues are addressed before you consider doing  new  springs and ride height if then needed 

Enjoy 

That should be suspension travel above ( spell check nonsense ) 

OK, then I will have to find a suspension shop and get it inspected. Perhaps they will suggest replacing the springs but some other thing could be wrong. The car drives great except for bumps. It does jiggle a bit on certain roads and I chalked that up to old age. I don't know whether the chassis has loosened from the body in some way. I've never had to check anything like that in a car.

If you want replace your springs maybe you should contact Kanter instead. I bought all suspension parts from them. Very satisfied. Springs, shocks, brakes and the full front end kit (super). The car is feeling excellent on the road.

The only thing I'm not happy about was the info I received after ordering. Kanter doesn't display the HD springs. So when I ordered online I wasn't aware that they had HD springs as well. It was when the parts was paid and shipped Jason informed that there was HD springs available. He got them for his car. So I fitted the standard springs. Maybe HD springs would be a step better, but frankly how the car behaves and stands correctly its a pleasure with the standard springs.

Just checked the Kanter website and it looks like they have a short period sale right now.

Many thanks. I'll have a look at it appears I should get everything checked before grabbing the springs, but it seems likely the springs would help, no telling how old they are. I would think HD springs might affect the Cadillac ride. I don't want to stiffen the ride, just stop the bouncing. 

have you checked the ball and yoke mounted on the top of the rear differential? if that is damaged or pulled out of the bracket  the car will sway and bounce from that as well

No, I have not. Thanks for that, I will get it done.

have you checked the ball and yoke mounted on the top of the rear differential? if that is damaged or pulled out of the bracket  the car will sway and bounce from that as well

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