Cadillac Owners Forum banner
  • Hey everyone! Enter your ride HERE to be a part of September's Ride of the Month Challenge!
1 - 14 of 14 Posts

·
Registered
Sold my 2009 CTS4 and my 2004 CTS
Joined
·
121 Posts
Discussion Starter · #1 ·
My 2009 CTS4 has had this hark clunk noise in the rear since I bought it a few years ago. I was pretty sure I knew what the problem was based on several threads on this forum. It was tough to confirm, especially when the suspension was loaded on the ground, or hanging by the shock when jacked up.

Most of the CTS's with this problem have been fixed under warranty, but for those of us out of warranty...

I finally made an effort to confirm that I had bad shock bushings a couple weeks ago. With the car raised, I put a jack stand under the knuckle to hold the suspension up, while I removed the lower shock bolt. With the shock detached, the bushing slipped right out of its outer steel sleeve. The steel sleeve was still pressed into the knuckle. (The rubber bushing is supposed to stay bonded to the steel sleeve.) Clearly this was not right. Both sides were the same.

There are replacement bushings on Ebay for $10-20/pc, but you'll need to press the old sleeve out, and press the new bushing in. Generally, this type of bushing is not supposed to be serviceable when pressed into aluminum.

In my searches for information, I never saw any pictures, so here are a couple:



They are out of position by about 1/4".

So, It looks like I needed a couple knuckle assemblies for $100-200 on Ebay.
But in the meanwhile, what the heck, I cleaned the parts with starting fluid and I slathered them with some grey Permatex and slid them back in, and bolted the shock back on. I jammed a plastic clip in-between the shock and knuckle to keep it centered. I let it cure for a day.

Amazingly, my clunk is gone. I don't know how long it will last....
 

·
Registered
2008 CTS 3.6 RWD LY7, FE2
Joined
·
55 Posts
I couldn't figure out how to get the old bushing out at first so I wrapped it in a couple layers of duct tape to reduce the clearance knowing I would have to fix it later. Amazingly its still quiet as can be 6 months and 12k miles later.
 

·
Registered
Sold my 2009 CTS4 and my 2004 CTS
Joined
·
121 Posts
Discussion Starter · #3 ·
Yeah, I figure there's not a lot of side-load on the bushing/shock. It doesn't take much to keep the bushing from sliding around.
 

·
Registered
08 CTS blk/blk
Joined
·
383 Posts
I had the bushings replaced by a mechanic. The bushings are available after market and are cheap. The aluminum sleeve around the rubber is paper thin and the install must be done carefully and slowly. The mechanic crushed one and we had to order another. Since we changed them that clunk is gone but i also can hear one of my calipers banging; those are next.

best of luck
 

·
Premium Member
2009 CTS4 3.6L, 2014 CTS4 3.6L Lux
Joined
·
29 Posts
581429

Hand Joint Auto part Finger Automotive exhaust Well, here's a shot of my 09 CTS4 right rear shock bushing. With my index finger, I can pull down the lip of the bushing material that seems to have shifted out. I don't see this on the left side. Clunks over bumps. I'm going to buy a bushing extraction kit and replace it. Replacement bushings only about $40.
 

·
Super Moderator
Go ahead, blame me. Everybody does 🙄
Joined
·
13,533 Posts
Welcome, ehughlett.

Let us know how the replacement goes and be sure to include parts sources to help others out.
Best of luck with the repair!
 

·
Registered
2014 CTS4 Sport Wagon*Luxury 2016 CTS V-Sport Premium
Joined
·
2,890 Posts
yes and if you could share a bit more information about your car and where on the planet you drive (do you get Winter and salted roads?)...miles on your vehicle???...

hope this fixes up your ride...

Bill
 

·
Registered
'12 CTS Performance Sports Wagon AWD
Joined
·
3,277 Posts
When I changed similar bushings in my truck I used a 2 step program to get them out. In my case the bushings were still connected to the sleeve. Funny how fast and how complete they burn when you light them with a butane torch. However the smoke coming off them should not be breathed... You may find another way to get them out but for me this was the simplest.

Once they are removed, shrunken or whatever method you use to get them out.... I used a chisel and hammer and collapsed the metal sleeve to the middle of the previous bushing and they come right out. Just be careful not to mar the metal in the arm. Not that it maters much if you do a little but you don't want to have any rough surfaces.

Cleaned up where the bushings went in, installed new bushings with a small press and away you go. Theoretically you could just use a long bolt, a nut and a couple of washers big enough to cover the whole bushing to use as an installation tool. A washer on each side of the arm, bolt through and tighten the bolt. The bushing will slide right in.
 

·
Registered
08 CTS DI
Joined
·
2,789 Posts
Looks like a safe location for a polyurethane bushing replacement. That service location shouldn't increase the harshness of the ride the way they tend to do when installed in the control arms. I believe that's why the performance strength poly engine mounts targeting the V sort of faded from the front lines as an upgrade. We typically want to know the motor is running without feeling that it is.
 

·
Registered
2009 CTS 3.6L DI rebuilt to FE3 J55 G80 3.42:1
Joined
·
2,061 Posts
If your car has significant miles on it and you just change the one bushing, you'll be back in there for more repairs sooner than you think. These cars have a design-flawed ABS tone ring in the hub, and the rest of the bushings in the upright will be worn as well.

If I were you I would change both knuckles and hubs, not just the bushing. Actually, I would replace all the rear suspension wear items if you're over 100K miles, but that is me - I'm a perfectionist when it comes to suspension. But just the lower knuckle bushing? Waste of time.
 

·
Registered
2009 CTS 3.6L DI rebuilt to FE3 J55 G80 3.42:1
Joined
·
2,061 Posts
And just to put it all in context, a new OEM knuckle is $129 plus shipping. So don't fart around with buying a bushing extractor kit and parts and pulling and re-using the old hub near the end of it's life. Don't pay your labor fiddling around, or the mechanic hourly rate. Mail order yourself a good deal on affordably-maintainable American car parts, save a bunch of time or labor $$ on the job, and have new stuff out back that will last. We all like a new rear end.

That's part of what is great about Cadillac, maintenance has the potential to be a lot more affordable than some other makes.
 

·
Registered
2012 CTS4 Premium
Joined
·
172 Posts
well, this explains the clunk for the rear of the car when i hit a good size bump at speed! Thanks for the thread and info
 

·
Registered
2010 CTS4 sedan
Joined
·
2,184 Posts
I've got the same condition. Just finished overhauling my fronts. Replaced my rear shocks a few years back and now I have the clunk and a squishy sound. Have isolated it to the rear passenger side. No doubt it's this bushing.
 
1 - 14 of 14 Posts
Top