Addco 639 Rear Sway Bar Installed - Chevy Impala Forums
8th Gen Suspension Springs, Shocks and Brakes.

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post #1 of (permalink) Old 03-02-2018 Thread Starter
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Addco 639 Rear Sway Bar Installed

Just installed on my 2012 LTZ. Front bar is the stock 32-33mm so I'm not touching it. I already had Vogtland springs, front and rear strut tower braces F/R, poly front bushings and on the rear bar I had installed poly bushings and MOOG end links thinking that the stock 15mm vs Addco 19mm wasn't enough of an increase in size to be worth getting. But, since I have done almost every mod to my car that I can think of, I got bored and decided to get the Addco 639 anyways. Wish I would have done it sooner. Its the best handling mod I have done hands down. Go out and get one, you will not regret it. Even though its only slightly bigger, its designed different and much stiffer. They may become extinct soon, as I had to wait months to get mine from Andys Auto Sport, not sure if there is much market for them anymore...

To get the best price go to Andys Auto Sport and click on their price match, "stomped up prices" and send them the info of Neverenoughauto, who sells them for $160.77 and Andys will lower their price down to I believe $148 shipped is what I got mine for.

The only thing I don't like about it is that its not totally compatible with the magnaflow exhaust, I had to loosen and lower and re-adjust the exhaust quite a bit from where it was and it still hits the sway bar on bumps. I may try lowering it a bit more and or getting something durable, but "squishy" that I can zip tie to the sway bar where it hits the exhaust when going over bumps to stop the noise. Anyone else have this problem?
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post #2 of (permalink) Old 03-03-2018
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I put one of these on my car over a year ago. I ordered from JEGS and it was on back order then too. If I remember right the manufacturer was out of one of the bushings.

2012 impala LT
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post #3 of (permalink) Old 03-04-2018
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I agree that the Addco bars will most likely not be available for much longer. I also think that BMR stuff and what other little bits out there might not be available for much longer. Not much aftermarket performance interest in these cars anymore... I have noticed that BMR prices are going up. I am going to have to start buying stuff little by little and then do an install later.

The Addco bar did make a nice improvement and if you can get it for less than $200 shipped than go for it. Be prepared to wait for it though. Everyone advertises it but no one stocks it.
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2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Polk Audio Components and 6x9s, Pioneer, Kenwood amps and sub, Addco Rear Sway Bar, ZZP Strut Tower Braces, LED fogs and low beams, back up and interior lighting, SS dash, stereo and shifter trim.
2004 Pontiac GTO
- Garage queen from day 1... bought brand new 12/31/04... Quick Silver Metallic/Black/6 speed... too much to list
2004 GMC Yukon SLT
- Wife's DD... bone freakin stock
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post #4 of (permalink) Old 03-05-2018 Thread Starter
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oops I had the measurements wrong, and its too late to go back and edit... stock one is 18mm Addco is 22mm
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post #5 of (permalink) Old 04-10-2018
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I've done the following
  1. The Don Rome STB set with the Dimpled SS front bar to clear the LS4 V8 alternator. Made a bigger difference than I would've thought.
  2. Addco 639 rear swaybar with Moog K6662 end links and 7/8" (22mm) Moog K90397 Poly bushings with the GM straps lubed with Sil-Glyde. The squishy rubber bushings that ship with the Addco bar will eventually break down and the steel sleeves will slam and clank against the rear crossbar.
  3. The Dorman 927-101 front swaybar with Energy Suspension Poly bushings and Moog End-Links. The bushing part number is in the LT1-tech W-Body suspension thread. It honestly didn't seem to change much but the old one was cracked at the end so it had to go.

BMR, UMI and ZZP-Performance still sell tubular lateral and trailing arms. The lateral arms usually have adjustments on both arms... not just one. Some only advertise compatibility with the Gen VII Impalas. The rear trailing and lateral arms fit the Gen VII and Gen VIII chassis.
Since the rear arms fit the W-Bodies from the 90's til the end... they may not disappear as quickly as parts that are a bit more model specific. They will go away eventually tho.
Rear swaybars are a bit more difficult since they tend to be more model-specific. Worst case you can at least upgrade the LT, LS and Base Impala to the FE3 Impala SS or the FE4 Monte Carlo, Buick Lacrosse Super, or maybe the Pontiac GXP rear bar.

I've purchased the BMR lateral links and the UMI DOM (Drawn Over Mandrel) seamless tube trailing arms for later upgrade.
I've also bought Moog Variable Rate springs and Buick Lacrosse Super Bilstein Struts so I'm gonna have a suspension party in the barn this spring.
The Impala SS and Monte SS are a Buick Super 3,700-ish lbs curb weight. The V6 engine Impalas are closer to around 3,500-ish lbs so the Pontiac GXP struts and lighter rear springs are better suited for those. Look at the page two posts on the KYB AGX thread where it skewed slightly off topic into springs and stock-ish Bilstien struts...

If you're on a tight budget and have the FE1 or FE2 stamped sheet metal trailing arms instead of the solid "SS" FE3 or FE4 solid trailing arms you can probably find used "SS" trailing arms for a pretty reasonable price. They will help some but not as much as the tubular arms. I'm likely to be selling mine later this year... I have the old 2009 SS swaybar stuck in the rafters of the barn with a scribbled-on toe tag too.

Don't overlook the brakes. You can go to the 12.7" stock 2012 "cop brakes" with lots more surface area for not a lot of money. There are several recent threads. I'll probably make my own when I finish this round of upgrades later this spring.

I finally got rid of those miserable Goodyear Eagles and installed a set of Michelin Pilot A/S 3+ 235/50ZR18 97Y tires that will actually have rain traction and will hang onto the corners. The W tires would be just fine but the Y rated tires pretty much fell in my lap for a pretty decent price.
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2009 Impala SS
"Speed never killed anyone. Suddenly becoming stationary... that's what gets you." Jeremy Clarkson

Last edited by hatzie; 04-10-2018 at 09:36 AM.
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post #6 of (permalink) Old 04-11-2018
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@hatzie...

You used those Moog K90397 sway bar bushings on the Addco rear bar? If so, how are they holding up as of now? I agree the supplied Addco bushings are garbage. I know the stock rear bar bushings have that slight angle to the bottom side of the bushing where it meets the cross member. Those bushings work good?

2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Polk Audio Components and 6x9s, Pioneer, Kenwood amps and sub, Addco Rear Sway Bar, ZZP Strut Tower Braces, LED fogs and low beams, back up and interior lighting, SS dash, stereo and shifter trim.
2004 Pontiac GTO
- Garage queen from day 1... bought brand new 12/31/04... Quick Silver Metallic/Black/6 speed... too much to list
2004 GMC Yukon SLT
- Wife's DD... bone freakin stock
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post #7 of (permalink) Old 04-11-2018
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I haven't looked at them since I put em in over a year ago.

I will comment when I pull it out of the barn and start swapping in the Buick Super Bilsteins and the Rear lateral and trailing links. I'm still getting winter here tho...

2009 Impala SS
"Speed never killed anyone. Suddenly becoming stationary... that's what gets you." Jeremy Clarkson
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post #8 of (permalink) Old 04-12-2018
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Ok cool... My Addco bushings are starting to get noisy again. I'd rather replace them this time, for good.

2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Polk Audio Components and 6x9s, Pioneer, Kenwood amps and sub, Addco Rear Sway Bar, ZZP Strut Tower Braces, LED fogs and low beams, back up and interior lighting, SS dash, stereo and shifter trim.
2004 Pontiac GTO
- Garage queen from day 1... bought brand new 12/31/04... Quick Silver Metallic/Black/6 speed... too much to list
2004 GMC Yukon SLT
- Wife's DD... bone freakin stock
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post #9 of (permalink) Old 04-16-2018 Thread Starter
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i noticed when doing my 12.7" police brakes that on my front sway bar the metal strap that came with my poly bushings is starting to break on the front on both sides, they are energy suspension pieces i believe. Anyone have this problem and recommend a different brand?
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post #10 of (permalink) Old 07-22-2018
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Hi Everyone,

I can confirm that the Moog K90397 sway bar bushings will fit on the Addco rear bar, at least initially. They are flat on the back, not tapered like the stock/Addco versions. However, I put them on today and the noise I've been chasing with the Addco Bushings is gone for now. I was having to lubricate the Addco versions every week or ten days. I believe there was a slip-stick problem with the bushing sticking to the bar. I'll report back after a few weeks using the Moog Version. I didn't use any Silicone grease on the Moogs. If anyone else has any great ideas or parts that will work, please add them to this thread.

Best Wishes,

Art
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post #11 of (permalink) Old 07-22-2018
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^ Art, imports or exports???
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post #12 of (permalink) Old 07-31-2018
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Imports and Exports...Iím an importer/exporter.

Those Moog bushings are working great. They are silent, whereas the addco versions that came with the bar were really noisy. Iíll write back if I anything negative happens.


Sent from my iPhone using Tapatalk Pro
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post #13 of (permalink) Old 10-02-2018
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Question

So does this bar, Addco 639 rear swaybar, fit the 2015 Impala Limited Fleet? I see it listed as fitting 1998-2010.
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post #14 of (permalink) Old 10-04-2018
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Quote:
Originally Posted by Jeepster09 View Post
So does this bar, Addco 639 rear swaybar, fit the 2015 Impala Limited Fleet? I see it listed as fitting 1998-2010.
I remember reading somewhere that it fit the 2011 & 2012... I can't find the thread tho.
I would think if it fit the 2012 it'll fit the 2013-2016 Limited Fleet cars.

The Moog K90397 sway bar bushings are still ticking at just over 2 years. The Addco bushings lasted about 20 days.
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2009 Impala SS
"Speed never killed anyone. Suddenly becoming stationary... that's what gets you." Jeremy Clarkson
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post #15 of (permalink) Old 10-06-2018
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I just read the first post in the thread. They fit on a 2012...
Dooh!!! Thought I'd last a little longer before the Alzehimers got going for real. Guess I'm really heading over the hill now. CRS
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2009 Impala SS
"Speed never killed anyone. Suddenly becoming stationary... that's what gets you." Jeremy Clarkson
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