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Rear sway bar
#1
I have been trying to install the Addco 990 rear sway bar in my 72 Mach 1. It has the factory 1/2” bar and the 990 is a 7/8” replacement. It’s supposed to be a direct replacement for the factory one, with no modifications necessary. 
Well the one I got is about 1 1/2” to wide where the bushings mount it to the frame rails. The center line of the holes for the end links are a good 3/4” wider too. I just can’t understand why they only give you a very narrow space one the new bar for the frame bushing mounts. So when I bolted one side on, the other side was outside the frame rail a good 1 1/2. And when I would get the end links straight up and down one one side the other was leaning out towards the wheel quite a bit. I took it back out cause it just doesn’t fit. Damn it!
Has anyone else run into this before with this bar? Pretty sure I got the correct one. Here’s a couple pics of the new and old one together. I have the frame mounts where they were in the car on the old bar. And they are about as far inward as possible on the new bar. I’m sure you can see what I mean. I thought I could maybe enlarge the bracket holes, but there’s no way.
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run_horse Run Horse Run!
John 72 Q Code
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#2
(02-29-2020, 10:18 PM)jpaz Wrote: I have been trying to install the Addco 990 rear sway bar in my 72 Mach 1. It has the factory 1/2” bar and the 990 is a 7/8” replacement. It’s supposed to be a direct replacement for the factory one, with no modifications necessary. 
Well the one I got is about 1 1/2” to wide where the bushings mount it to the frame rails. The center line of the holes for the end links are a good 3/4” wider too. I just can’t understand why they only give you a very narrow space one the new bar for the frame bushing mounts. So when I bolted one side on, the other side was outside the frame rail a good 1 1/2. And when I would get the end links straight up and down one one side the other was leaning out towards the wheel quite a bit. I took it back out cause it just doesn’t fit. Damn it!
Has anyone else run into this before with this bar? Pretty sure I got the correct one. Here’s a couple pics of the new and old one together. I have the frame mounts where they were in the car on the old bar. And they are about as far inward as possible on the new bar. I’m sure you can see what I mean. I thought I could maybe enlarge the bracket holes, but there’s no way.




[Image: 6624-A6-D4-F09-B-4619-9-D9-C-E3-A43-BF85118.jpg]
John, I just saw this a minute ago or I'd have replied sooner.
 Now I remember I did have a bit of trouble fitting the 7/8" bar, but only where the fuel vapor return line is. I needed to alter the mount for the hose by using a longer bolt and a spacer. I had no problem fitting to the frame and I do have a pic that shows that... sort of.

[Image: IMG-1108.jpg]

Geoff.
 I learn something new every day!
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#3
I can see from this pic that the bushing mount is really favoring the inside of the bend. I am really having problems with that on  both sides. I just didn’t seem right, but I found some different mounts that I can use with the new bushings. I’ll see if that works I guess. Thanks

run_horse Run Horse Run!
John 72 Q Code
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#4
I tried again to fit this sway bar in, but not happy with it. Both end links lean out some and forward too. I think they should be pretty much vertical? It’s just seems to wide. It’s actually about 1” an inch wider than the stock one, which leaves about an inch from the insides of the tires. Kinda close and if I ever put a wider tire on now it’s even closer. I only have P235-60R15’s on 7” wide rims.
I ended up calling addco and talked to a couple guys about it yesterday. They asked for some pics of the old one and some of the new next to each other, so I sent a few. They did comment on how different the bars are and wanted me to talk to someone else today. I got a text today instead from the guy I sent the pics to and he said he would have to get back to me tomorrow. He said he need to get some more measurements, so they are checking this out I guess.
Here’s a couple pics of the sway bar bushing that is jammed into the bend of the bar and how the end links are leaning. I’ll let you know what they say.[Image: 613-EC8-FD-2938-4-E13-ADAE-7-F0-FFC6-CCFB1.jpg]

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[Image: 03-DA55-ED-1908-43-EF-86-F9-2-E2766-F59168.jpg]

run_horse Run Horse Run!
John 72 Q Code
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#5
(03-04-2020, 05:44 PM)paz Wrote: I tried again to fit this sway bar in, but not happy with it. Both end links lean out some and forward too. I think they should be pretty much vertical? It’s just seems to wide. It’s actually about 1” an inch wider than the stock one, which leaves about an inch from the insides of the tires. Kinda close and if I ever put a wider tire on now it’s even closer. I only have P235-60R15’s on 7” wide rims.
I ended up calling addco and talked to a couple guys about it yesterday. They asked for some pics of the old one and some of the new next to each other, so I sent a few. They did comment on how different the bars are and wanted me to talk to someone else today. I got a text today instead from the guy I sent the pics to and he said he would have to get back to me tomorrow. He said he need to get some more measurements, so they are checking this out I guess.
Here’s a couple pics of the sway bar bushing that is jammed into the bend of the bar and how the end links are leaning. I’ll let you know what they say.[Image: 613-EC8-FD-2938-4-E13-ADAE-7-F0-FFC6-CCFB1.jpg]

[Image: 3-E714-A18-BB73-425-A-A90-C-E98-BB3-FB45-A9.jpg]

[Image: 6-DAF5-B52-DBB2-411-E-93-FF-971-B5003-E7-AC.jpg]

[Image: 686887-C8-955-F-43-BA-9107-C2904599573-C.jpg]

[Image: 03-DA55-ED-1908-43-EF-86-F9-2-E2766-F59168.jpg]
John, I'm still without my computer, so on the wife's tablet. The fit at the brackets looks about the same. I'll  measure my original bar tomorrow and compare it to the Addco 990 and let you know. Sorry I can't  be of more help right now, but I don't  think you'll  have any real problems.
Sent you a PM.

Geoff.
 I learn something new every day!
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#6
Just got off the phone with Addco. They want me to send them my factory sway bar and of course they are paying postage there and back. They want to make this bar correct. I even suggested that they make it in 3/4” instead of 7/8. I’m going to send them mine and see what they can do. I was a bit surprised, thought I would just get the runaround, but seems like they do care! I will keep you guys posted on what happens.

run_horse Run Horse Run!
John 72 Q Code
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#7
jpaz Wrote:Just got off the phone with Addco. They want me to send them my factory sway bar and of course they are paying postage there and back. They want to make this bar correct. I even suggested that they make it in 3/4” instead of 7/8. I’m going to send them mine and see what they can do. I was a bit surprised, thought I would just get the runaround, but seems like they do care! I will keep you guys posted on what happens.
That's great.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#8
(03-05-2020, 01:24 PM)jpaz Wrote: Just got off the phone with Addco. They want me to send them my factory sway bar and of course they are paying postage there and back. They want to make this bar correct. I even suggested that they make it in 3/4” instead of 7/8. I’m going to send them mine and see what they can do. I was a bit surprised, thought I would just get the runaround, but seems like they do care! I will keep you guys posted on what happens.
So,  why did Addco NOT DO THAT TO START WITH.? Yes ,for sure it was not a perfect fit, but I've had no issues with mine. Still no computer till next week, got to buy a new one, then I'll be able to reply better.

Geoff.
 I learn something new every day!
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#9
(03-05-2020, 09:26 PM)Stanglover Wrote:
(03-05-2020, 01:24 PM)jpaz Wrote: Just got off the phone with Addco. They want me to send them my factory sway bar and of course they are paying postage there and back. They want to make this bar correct. I even suggested that they make it in 3/4” instead of 7/8. I’m going to send them mine and see what they can do. I was a bit surprised, thought I would just get the runaround, but seems like they do care! I will keep you guys posted on what happens.
So,  why did Addco NOT DO THAT TO START WITH.? Yes ,for sure it was not a perfect fit, but I've had no issues with mine. Still no computer till next week, got to buy a new one, then I'll be able to reply better.
I don’t know why they didn’t make it more like the original. But it sure sounds like they want to correct it.
Well, the way it fits on mine is not as good. The bushings are really jammed on the inside bends, especially on the passenger side. I don’t think it should be this way, I can’t get the splits in the bushings to close all the way up. I think they would wear out way to soon and I don’t see how the bar can rotate properly. I’m sure you can see this in the pics I posted earlier.

run_horse Run Horse Run!
John 72 Q Code
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#10
My guess is they originally designed it off a factory piece, but over the last 50 years, something was lost. I've seen it plenty of times with migrating from paper to CAD, and 2D to 3D manufacturing drawings. A simple dimensional error can cause exactly what you're seeing.


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