Hey everyone, the rear end of my 63 coupe has a loose feeling to it, almost like riding on jello.  I’ve replaced the shocks, the trailing arm bushings, upper control arm bushings, upper control arm ball joint, driveshaft center support,and transmission mount, to no avail.  All but 2 body mounts look to be in really good shape, the 2 in question are completely deteriorated with a bolt that just spins around,  I have them circled in the photo, do you think that these would cause my problem?

    Also the shop manual shows the bushing as an “F” the bushing in this location on my car definitely looks more like a “B” , does anyone know the history and purpose behind this mount? I noticed that it’s not on the previous years.

Any help would be appreciated, thank you.


Views: 102


Reply to This

Replies to This Discussion

All trailing arm bushings—— sold on the market  today have about a 600 mile lifetime which is extremely short lived and an unacceptable replacement part 

Have you put 600 miles on them since they were replaced as they may have become damaged due to an inferior replacement product and the only replacement part available 

If you find they are damaged ( distorted ) when you check them   I will tell you what to purchase to fix the problem 

Not sure myself about your  body mounts causing the problem  but best to be repairing them also to get back to that Cadillac ride that these cars do very much better than other year Cadillacs when they are driving as they should from the factory 

I do see that you have replaced many of the rear end suspension parts that could be a part of your issue 


My last sentence means it is a good thing you have replaced the parts you have to get to the bottom of your problem which I see could be misunderstood as written 


Luckily I read some past discussions on the trailing arm bushings, I went with Dan McNarry’s polurathane replacement bushings.

Without any pictures its very hard to figure out anything. Poor body mounts wouldn't make the car riding on jello. My guess its something else. And as Tony points out the replacement bushings are crap.

See Polyurethane Replacement Trailing Arm Bushings for some ideas. Maybe Dan still can make these replacement arms.

Maybe jello might have been a bad analogy,  it’s like a springing feeling almost like the shocks aren’t working. I’ve ruled the shocks out because I’ve gone through 3 sets.  I’m also hesitant to think it’s a body mount but I figured I’d get a second opinion.

while that may be an ugly cracked mount, it's not evident that it's a problem from this pic.
Bad rubber mounts are mounts that move, and they leave a tell tale trail;  the metal around and between the bushings would be shiny and their would either be black smearing of the rubber or rubber dust around it.    This is undisturbed, and there is rust on the metal in the middle of the brace, so this mount is not moving relative to the car.  

Dans custom made trailing arms are the only answer we have  for the rear trailing arm bushing issue  

You can put rubber spacer they sell that insert in the  rear springs that will slow down the spring action you are explaining 

Just jack up the car that will expand the springs and insert the rubber spacers and drop the car  - a cheep fix 

The other option would be to replace the rear springs if they have lost there spring action over the years 

The springs are the only thing you have not changed at the rear suspension 

I do think the rubber inserts will work out


An update on this,  I took Tony’s advice on the spring spacers,  and the car Sits, rides,  handles, and looks a heck of a lot better.  This solved half the problem,  the jello feeling,  I discovered was from the exhaust.  The car came a beautifully welded custom exhaust and they used universal hangers that are very tight, this almost made the exhaust feel like it was spring loaded and that spring feel transferred through the car when I hit a bump.  
Thanks for all the help.  



  • Add Photos
  • View All


Classic Cadillac Parts For Sale - Misc Items

Started by Jason Edge in For Sale. Last reply by Jason Edge 1 hour ago. 287 Replies

I have posted a few Misc items over on my Classic Cadillac Parts Facebook page at…Continue

Tags: classic cadillac parts, classiccadillacparts

64 caddie Brake drums

Started by mark zimmerman in 1963/64 Cadillac Specific Discussion. Last reply by Tony and Ginny 429 2 hours ago. 2 Replies

Are the front  brake drums the same as the rear ones? I had my garage install new drums on the car and now at 25-35 mph the car shakes like the  front wheels are going to fall off. Car has new brakes…Continue

Caddy Cruising with the Family

Started by Jason Edge in General Discussion 15 hours ago. 0 Replies

I've had a great couple of weeks entertaining family since Oct 11, and the 64 Caddy has played a big part.  Knowing aunts and uncles and many other relatives would be joining us for a celebration of…Continue

64 front passenger fender removal

Started by Chris Mcdougal in 1963/64 Cadillac Specific Discussion. Last reply by Jason Edge 17 hours ago. 1 Reply

Hey guys I have search around the discussion boards and can't find anything.. but trying to get this passenger front fender off of my 64 deville 6 window got all the obvious ones and the one behind…Continue

Tags: removal, Fender

Blog Posts

Rochester throttle body gasket

Posted by Phil on September 29, 2021 at 8:18am 5 Comments

Hello,  would anybody be able to tell me if I’m using the correct gasket on my Rochester throttle body? It doesn’t  look right to me.  I’m not sure if the carb actually ran with this gasket because I got it used with no history.  Any help would be appreciated …


Rumble Sound at 55-60 mph

Posted by Ray Schick on September 20, 2021 at 10:45pm 6 Comments

64 Coupe DeVille , while driving at 55-60 mph I have a oscillating rumble sound . Steering wheel does not shake or vibrate . Transmission mount looks good .Tires were replaced 2 years ago balanced and rebalanced recently. Axel bearings were just replaced, rear differential assembly was just replaced with a Posi track ,pinion bearings good. Fresh gear lube. Driveshaft checked and balanced the other day ,new center bearing installed and new bearing carrier assembly too. Trying to figure this…


1963 series 62 convertible transmission issue

Posted by Matthew VanDeWater on June 22, 2021 at 3:03pm 1 Comment

Hello I've been restoring a 63 for way to many years. Down to almost done, but have issue with trans linkage, when column in park shift rod 2 inches short. everything original. been trying to find picture of manual rod hooked up from under car to see position of linkage. was wondering if anybody has access for pictures. I wanted to see if my manual linkage is bent  wrong out of the trans if somebody dropped the trans or something. Doesn't make sense why it doesn't work. Thanks for any input…


New vehicle in the club

Posted by Patrick Westphal on June 17, 2021 at 4:00pm 1 Comment

I was successful in getting a vehicle from the New York contact I talked about at the last club meeting. I am still trying to figure out how to post a picture of the vehicle that is tied with this comment so if you see a random picture of a black convertible in a yard, that's me haha.  …



  • Add Videos
  • View All

© 2021   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service