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1999 Deville Base
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Discussion Starter #1
I recently discovered that my rear suspension supports (Upper & Lower Suspension Cross-member Insulators) now mostly consist of a few bits of rust held together with some rubber pieces. Based on what the shop manual sates, this shouldn't be too big of an issue to replace, especially since i have a full shop set up with a car lift and everything. :cool2:

Can anyone provide me with a bit more information (details) than what i have below? Any help would be much appreciated. I was also thinking about replacing the Suspension Cross-member Bushing while i was at it.

View attachment 431673
 

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1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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6,796 Posts
I've never replaced the bushings but I've removed the complete assembly before on one of those cars and the longest part of the job was dealing with the parking brake cable. If you're doing it on a hoist support the suspension assembly, remove the bolts and raise the car a bit to get the space to slide the bushing out. It might be easier to do it with the car on stands instead and use a jack to support and lower the assembly. I don't think you have to disconnect anything just to lower it to replace the bushings but keep an eye on everything just in case.
 

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1999 Deville Base
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Discussion Starter #3
Ohh the joys of owning an older car in the rust belt. After discovering that my rear upper and lower suspension supports are rusted out, my day took a turn for the worse. In the process of evaluating my problem, I discovered that one of my rear air shocks and brake lines are both leaking and the Fuel filler neck is about to fall off because of rust.

In an attempt to stay positive, I now have a good reason to remove the entire rear suspension sub-frame. :banghead:

Replacing all rear brake lines, both shocks, fuel filler neck, and all rubber bushings/mounts cost me a solid $600 in parts. Luckily my labor is free (please shoot me :crying2: )
 

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1999 Deville Base
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Discussion Starter #4
So, first step is completed. The entire rear suspension cross member is removed from the car. Looking at the state of the cross member, I assume this was the easy part!!
 

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Alexandra - 96 SDV Clyde - 15 Silvy
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Not sure you can

Damn cancer, I hate how rust can sneak up on you like that

Just another reason for me to powercoat suspension components during restoration...even if they are new.
 

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1999 Deville Base
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Discussion Starter #7
CadillacLuke24, I totally agree with you, but unfortunately our Devilles are barely worth the repair i am doing in parts alone, let alone labor. Trying to powder coat anything on this car would literally be like putting make-up on a pig :).

My plan is to weld in some new material at the upper cross member support bushing area and then grind as much rust off the entire thing and give it a good POR-15 treatment. At that point its just a matter of slapping all the new parts on and put it back together.
 

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98 DeVille, 97 DeVille d'Elegance
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I don't miss the rust belt one bit.... For the cost of all those bushings have you considered getting a rear assembly off southern used car ghat is complete.
 

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1999 Deville Base
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Discussion Starter #9
rodnok01, Not a bad idea. But I assume even in the south you guys have dry rot and the shocks would also be in questionable condition after 17 years as well. Furthermore, all bushings combined cost me $200 and i assume the shipping of that thing alone would have been more than that.

All that being said, the next step will be de-rusting my cross member and as such your idea does sound highly appealing to me right now :p

Ohh well, I will post a few pictures of how it looks once i am done re-working the cross member before i put it back in. we will see how far my patience brings me.

One question I still have is if I should replace the Air Compressor dryer while i am at it. How do i know if it needs to be replaced?
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Replace the ELC dryer/filter, especially if you can't document that it has ever been replaced. If you feel wealthy (about $200) you could replace the entire compressor assembly.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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The system is NOT "air ride". ELC has nothing to do with suspension control. It compensates for extra weight in the rear seat or trunk.

True on the rebuild .......... Have done it myself. My post was preventive maintenance - if the filter/dryer has overloaded and allowed any moisture/snot into the solenoid control head then it's only a matter of time before the control head freezes and dies from corrosion.

I moved your video to Tech Tips to make it available to a much broader audience.
 

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1999 Deville Base
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Discussion Starter #13
Suubmariner409, You are absolutely correct with your terminology. Thanks for adjusting the title and moving the video :2thumbs:
 

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1999 Deville Base
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Discussion Starter #15
Project Completed!

Finally the cross member is back in the car and all surrounding parts are replaced. All that is left is to reinstate the parking brake as soon as i get the new Rear Driver cable and brake line balancer.

Here is the final list of parts that were replaced:


- Both Upper Insulators (P/N:3538757): $ 33.47
- Both Lower Insulators (P/N:25678602: $ 12.39
- Insulator Bolt (P/N:11517635): $ 3.00
- Both Suspension Cross-Member Bushings (P/N:1627757): $ 44.00
- Both Rear Air Shocks (P/N:MONROE 40046): $206.70
- Air Compressor Filter (P/N:22124393): $ 12.52
- SunCore Dryer Rebuild-Kit: (P/N:G-24-2): $ 16.82
- Both Rear Proportioning Valves (P/N:19244448): $ 59.58
- Rear Right Brake Hose (P/N:19156577): $ 15.29
- Rear Left Brake Hose (P/N:18037782): $ 16.74
- Rear Center Brake Hose (P/N:18031927): $ 6.00
- Miscellaneous Brake lines & connectors: $ 52.10
- Parking Brake Connector (P/N:15714661): $ 1.90
- Fuel Filler Neck (P/N: 577099): $ 51.79
- POR-15 Kit: $ 67.00

This brings the total for the job to $599.30
 

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1999 Deville Base
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Discussion Starter #17 (Edited)
So, the project is finally done.

I was able to replace the remaining few parts in order to get the parking brake working again as well as cleaned the car up from all the rust that landed all over it.

Long story short, dropping the rear Cross-Member was a lot simpler than I expected. For me the hardest part was getting all the brake lines bent correctly and connected, since i don't have a bubble flaring tool. Hope my info and pictures may help someone else to get his car back up and running.

On A side note, Check out my YouTube channel where i have a few more videos about my 99 deville

https://www.youtube.com/channel/UCj0NGao6DgXIMY5faP0ZKSQ
 

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CTS 2003 3.2 V6, Eldorado 8.2 v8 1974, SRX 2005 4.6 V8, STS 1993 4.6 V8, Chevy Van 1980 5.7 V8
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Hi,

I reopen this post, because i get a similar problem on my Cadillac Seville STS 1993.
I looking to fin the insulator GM 3538757 but just impossible to find it !
I found the lower insulator 25678602 (but i see the OEM for the Seville is 25678603, but don't see any difference, the 25678603 is impossible to find, so i found the 25678602, maybe a different hardness of the rubber.... but that will be ok)
And impossible to find the 2 bushings 1627757 (mine is not that bad, so i can leave it if i really don't find it).

Any idea to find the parts ? the most important is the 3538757 upper insulator, because mine can't be reuse again, i look on all possible web site, and nothing, plus, i am in France so no Cadillac dealership here.

If i really don't find it, i will use polyurethane and make me a new set, look that a 40 Shore on A scale.

Thanks
 

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Hi,

I reopen this post, because i get a similar problem on my Cadillac Seville STS 1993.
I looking to fin the insulator GM 3538757 but just impossible to find it !
I found the lower insulator 25678602 (but i see the OEM for the Seville is 25678603, but don't see any difference, the 25678603 is impossible to find, so i found the 25678602, maybe a different hardness of the rubber.... but that will be ok)
And impossible to find the 2 bushings 1627757 (mine is not that bad, so i can leave it if i really don't find it).

Any idea to find the parts ? the most important is the 3538757 upper insulator, because mine can't be reuse again, i look on all possible web site, and nothing, plus, i am in France so no Cadillac dealership here.

If i really don't find it, i will use polyurethane and make me a new set, look that a 40 Shore on A scale.

Thanks
I'm going to be doing this to my 97 deville as well and can't find the upper insulators, I have the lower insulators. Might have to fabricate something for the uppers, maybe hockey pucks

Project Completed!

Finally the cross member is back in the car and all surrounding parts are replaced. All that is left is to reinstate the parking brake as soon as i get the new Rear Driver cable and brake line balancer.

Here is the final list of parts that were replaced:


  • Both Upper Insulators (P/N:3538757): $ 33.47
  • Both Lower Insulators (P/N:25678602: $ 12.39
  • Insulator Bolt (P/N:11517635): $ 3.00
  • Both Suspension Cross-Member Bushings (P/N:1627757): $ 44.00
  • Both Rear Air Shocks (P/N:MONROE 40046): $206.70
  • Air Compressor Filter (P/N:22124393): $ 12.52
  • SunCore Dryer Rebuild-Kit: (P/N:G-24-2): $ 16.82
  • Both Rear Proportioning Valves (P/N:19244448): $ 59.58
  • Rear Right Brake Hose (P/N:19156577): $ 15.29
  • Rear Left Brake Hose (P/N:18037782): $ 16.74
  • Rear Center Brake Hose (P/N:18031927): $ 6.00
  • Miscellaneous Brake lines & connectors: $ 52.10
  • Parking Brake Connector (P/N:15714661): $ 1.90
  • Fuel Filler Neck (P/N: 577099): $ 51.79
  • POR-15 Kit: $ 67.00
This brings the total for the job to $599.30
Your posts have been very helpful thank you! I'm trying to tackle this project next.
 

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CTS 2003 3.2 V6, Eldorado 8.2 v8 1974, SRX 2005 4.6 V8, STS 1993 4.6 V8, Chevy Van 1980 5.7 V8
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I look on all possible website and reference, and just impossible to find.
So i get the polyurethane to make one myself.
I already done the 4 lower control arm bushing the same way with shore 65A poly, because this bushing are impossible to find too.
 
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