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post #1 of (permalink) Old 03-21-2017, 10:08 AM Thread Starter
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GMPP or ZZP rear sway bar

So this all started when I ordered an Addco 639 from Never Enough Auto for $160 then 1 week later received an email saying it is back ordered until 05/12/2017. I am not waiting that long and not sure I want to spend the extra $40 for the same item from Jegs. So I started looking at alternative options.

Option 1 - ZZPerformance rear sway bar (claims to be stiffer than the GMPP bar)

or

Option 2 - GMPP rear sway bar

Is the Addco worth 2x the cost of the ZZP bar? Seems like there are a lot of fitment issues with the Addco. I'm leaning towards the ZZP bar since it comes with poly bushings.

I already have in hand the Moog rear sway bar links and plan on doing the Dorman front sway bar next.

Has anyone had any experience with the ZZP bar?

Thanks!!
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post #2 of (permalink) Old 03-21-2017, 02:53 PM
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Right after your post back then I emailed a purchase question if they had one in stock or if I would wait months to get one. BOOM, I had it it within a week.

Waiting to slap it on.


OK back to the OP.
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post #3 of (permalink) Old 04-01-2017, 06:46 PM
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I just ordered the ZZP rear bar last night.. considering my stock sway bar is corroded and the Moog end links have already failed I will replace it all at once

2007 Impala 9C1.. Lowered, KYB, ZZP, DR, K&N, JBL... etc.etc.

2000 Camaro Z28..
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post #4 of (permalink) Old 04-01-2017, 07:51 PM
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The Addco bar is worth it if you can find one in stock. It is 22mm, making it the largest one available for the W-body. I have had mine on my 01 GTP and swapped it over to my Impala and there were no fitment​ issues with either car. The only issue I had was that the supplied sway bar bushings with the Addco made noise from day one. They say not to grease the bushings as it is not required, but I pulled the bushings out and greased them anyway... Solved the noise problem and it has been since January and it is silent. I also did not install the supplied lock keepers on the bar. It has remained still.

My biggest complaint with Addco is that their customer service is non existent. Good luck contacting them if you have issues with the bar. It is well made and it should last, but I tried contacting them every which way about the stupid bushings and did not get a response. Jegs could not get a response from them either... Just piss poor if you ask me.

2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Addco rear Sway Bar, ZZP Strut Tower Braces... More to come
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 #5 of (permalink) Old 04-02-2017, 04:10 AM
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Quote:
Originally Posted by WickedGoat View Post
The Addco bar is worth it if you can find one in stock. It is 22mm, making it the largest one available for the W-body. I have had mine on my 01 GTP and swapped it over to my Impala and there were no fitment​ issues with either car. The only issue I had was that the supplied sway bar bushings with the Addco made noise from day one. They say not to grease the bushings as it is not required, but I pulled the bushings out and greased them anyway... Solved the noise problem and it has been since January and it is silent. I also did not install the supplied lock keepers on the bar. It has remained still.

My biggest complaint with Addco is that their customer service is non existent. Good luck contacting them if you have issues with the bar. It is well made and it should last, but I tried contacting them every which way about the stupid bushings and did not get a response. Jegs could not get a response from them either... Just piss poor if you ask me.
So the Addco plastic bushings fit into the stock bushing retainers?

I planned on greasing them with Energy Suspension silicon grease anyway, I have been nervous that the supplied bushings may not fit the stock retainers.

From what I can understand, the two piece clamp on locks require some grinding so they will actually clamp tightly to the bar, but I haven't pulled everything out of the box, I guess I'll look at that today.

Why didn't you use them?
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post #6 of (permalink) Old 04-02-2017, 08:25 AM
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Quote:
Originally Posted by Carbide View Post
So the Addco plastic bushings fit into the stock bushing retainers?

I planned on greasing them with Energy Suspension silicon grease anyway, I have been nervous that the supplied bushings may not fit the stock retainers.

From what I can understand, the two piece clamp on locks require some grinding so they will actually clamp tightly to the bar, but I haven't pulled everything out of the box, I guess I'll look at that today.

Why didn't you use them?
Yes, the supplied Addco bushings will fit into the stock bushing clamps. Save yourself some money and a headache and apply a nice layer of Suspension grease on the inside and outside of the bushing before you install it.

And you are also correct about the grinding of the Addco clamshell keepers. Almost everyone that installed the Addco bar that commented about it mentioned having to grind the retainers down to fit properly, something not mentioned in the directions as a possibility. I tried them on to see if I could get lucky and no dice, needed a Dremel. So I said screw it, let's see if I have any issues without using these. The bar never moved in the grand prix and it hasn't moved in the Impala. I did have to pull the bushings to grease them and that was when I decided to leave the keepers off. I figured I am not having a problem so why bother. Give it a try without them and see what happens.
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2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Addco rear Sway Bar, ZZP Strut Tower Braces... More to come
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 04-02-2017, 08:28 AM
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And as FYI for the install, you will need to lower the exhaust down from the rubber hangers and let the exhaust hang while you R&R the sway bar. It will not have enough room to be snaked into place with the exhaust in the way. Stock or aftermarket exhaust won't matter, have to let it drop down to give you some working room. Once the bar is in place, there are no fitments issues unless you have a damaged subframe or something else out of the ordinary like that.
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2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Addco rear Sway Bar, ZZP Strut Tower Braces... More to come
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 #8 of (permalink) Old 04-02-2017, 10:05 AM
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Quote:
Originally Posted by WickedGoat View Post
And as FYI for the install, you will need to lower the exhaust down from the rubber hangers and let the exhaust hang while you R&R the sway bar. It will not have enough room to be snaked into place with the exhaust in the way. Stock or aftermarket exhaust won't matter, have to let it drop down to give you some working room. Once the bar is in place, there are no fitments issues unless you have a damaged subframe or something else out of the ordinary like that.
Thanks you very much for these tips.

I believe that I need to drive backwards up some ramps as the vehicle weight needs to be in the suspension while the new bar is installed.

I first envisioned having both wheels off so I can get at the upper mount of the links, but apparently I am just reaching around the strut to attach and tighten the link nut.

Is all this correct?
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post #9 of (permalink) Old 04-02-2017, 01:01 PM
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You can reach around the strut to do it but the link attaching nut may only loosen so far before it spins the stud. The stud is designed to be held by an open end wrench while you remove the nut. You may find the wheel a hindrance. I put the rear on jack stands, removed the wheels and swapped everything. I then backed it up on my ramps and tightened everything up.
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2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Addco rear Sway Bar, ZZP Strut Tower Braces... More to come
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 #10 of (permalink) Old 04-02-2017, 03:30 PM
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Should have included this above.... I tightened the endlinks up at the strut like normal, they don't need to be super tight. Then I left the endlink to sway bar and sway bar bushing brackets hand tight. When I backed it up on the ramps, I pushed the rear end down a few times to bounce everything and let it settle. Then I tightened everything down and called it good.
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post #11 of (permalink) Old 04-03-2017, 03:25 AM
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The Addco 639 comes with aluminum clamps, I thought that in the past they came with circular steel anti travel clamps, but what I was sent are aluminum and are an oval shape.

I need to remove about 1/32" from each face of both halves to allow for them to travel close enough together to actually pinch the bar so it doesn't move past where the clamp is tightened on it.

I almost think I'd rather have the steel ones like I've seen in the shop at work and in earlier pics of installs, because taking stock away from these leaves very little of the threads left in the lower half and clearance hole in the upper half, being they are aluminum.

I took pics but may not have time to resize and upload them for a while this week.
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post #12 of (permalink) Old 04-03-2017, 05:06 PM
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I have the same aluminum pieces. I have no plans of using them so if you happen to mess up cutting yours or don't like the fit, I'll give you​ mine... Just have to find them
... I know I didn't throw them out.

2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Addco rear Sway Bar, ZZP Strut Tower Braces... More to come
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 #13 of (permalink) Old 04-03-2017, 08:09 PM Thread Starter
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Thanks for the info guys. Looks like I am going to play the waiting game for the Addco bar. Going to be doing Struts and Lower springs also at the end of the month. Hopefully I will be able to do it all in one shot.

2009 Impala 2LT 157,000 miles as of 3/31/17
Mods:
Tint
MB Wheels Alpina 18X8
Dorman Front Sway Bar
Moog Front suspension
GMPP STB's
Canuck Motorsports GrandPrix lowering springs
KYB Excel-G struts
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post #14 of (permalink) Old 04-05-2017, 06:01 PM
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You could get lucky like I did and someone may have one in stock. I initially ordered from Summit and then got the run around on delay time. Out of the blue, I called Jegs and they had one in stock... Ordered it immediately and cancelled the order at Summit just as quickly. I believe @Carbide got his pretty quick too. Although it would be nice to swap all at once, it won't be too big a deal if you ended up doing the sway bar after the fact. Replace the rear endlinks with Moog endlinks when you do the swap. The Moog parts are much beefier then the stock links.

2014 Chevy Impala LTZ Limited
- My daily driver... 5% Window Tint, Rosen GM1210 Stereo, Addco rear Sway Bar, ZZP Strut Tower Braces... More to come
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 #15 of (permalink) Old 04-10-2017, 03:39 PM
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Definitely use the MOOG end links. The factory parts are spindly little pieces.

2009 Impala SS
"Speed never killed anyone. Suddenly becoming stationary... that's what gets you." Jeremy Clarkson
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