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Old 12-03-2012, 08:27 PM   #1
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Rear end off center....questions on cause

Hey everyone. First off, I did search.

Ok now for the no fun. I've for a near bone stock '06 m6 with 17s. So all stock suspension. Today is day two with the car so I'm doing my normal review of the car, checking for mods/maintenance etc. I found a super cheap set of stock 18s so I was looking at the wheels and when looking at the pass side I notice it looks sunk in pretty far compared to the front tires. I kinda assume its like mustangs and walk around to look at the driver side and per my 100% accurate hand measurement it's off by a good 3/4". I mediate my assume its of center right? I'm well aware of the bushings in this car being less thn crap from the factory, so I'm curious if some failing bushings could be the cause.

Main points I want to get to are:

Is it pretty normal?
How big of a deal is this? (Such as impact driving it stil)
Likely causes?
Things to check?


I have not been able to jack the car up and get a good look at the rear end yet, just FYI. Ill be doing that tomorrow when it's not about time for bed. Ill get pics of each side in just a second and post them.

Any help would be appreciated. Thanks y'all.
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Old 12-03-2012, 08:31 PM   #2
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Old 12-03-2012, 08:32 PM   #3
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These are the pics I've got. Let me know if you need any other info.


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Old 12-03-2012, 08:33 PM   #4
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And sorry for the autoguide posts. It's irritating and the stupid sig never turns off.
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Old 12-03-2012, 08:39 PM   #5
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Ever been wrecked?
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Old 12-03-2012, 09:31 PM   #6
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Quote:
Originally Posted by Kingmanbc...View Post
Ever been wrecked?

Not according to carfax and the deck lid doesnt show to have been taken off.


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Old 12-04-2012, 03:15 AM   #7
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Rear sub frame alignment?
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Old 12-04-2012, 07:18 AM   #8
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I can't tell Jack Snap from the photos. How about laying a straight edge on each side there and getting some actual measurments?
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Old 12-04-2012, 07:26 AM   #9
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Get a rear cradle alignment and pray it wasn't in a wreck.
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Old 12-04-2012, 07:35 AM   #10
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I'm confused by your post, but I don't think anything is wrong with your car...Are you just wondering why the rear wheels are sunk in so far? looks like both sides are sunk in the same, it's because the stock wheels are higher offset. You can push them out if you want, but about 6mm is the max to keep it hubcentric. Not sure how long the studs are, I have arps.

Or different wheels would push it out further.
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Old 12-04-2012, 07:35 AM   #11
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Quote:
Originally Posted by 2step...View Post
I can't tell Jack Snap from the photos. How about laying a straight edge on each side there and getting some actual measurments?

I can do that tonight. Or at least use the tape measure to show the differences.
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Old 12-04-2012, 07:37 AM   #12
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Quote:
Originally Posted by Shift_GRIND...View Post
I'm confused by your post, but I don't think anything is wrong with your car...Are you just wondering why the rear wheels are sunk in so far? looks like both sides are sunk in the same, it's because the stock wheels are higher offset. You can push them out if you want, but about 6mm is the max to keep it hubcentric. Not sure how long the studs are, I have arps.

Or different wheels would push it out further.

Didn't mean to be confusing. They are not even. I tried to show it in the pics but it is hard to do. Ill get the measurements so its easier to see tonight.


And I'm gonna get a full alignment soon to see if that will fix it.
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Old 12-04-2012, 08:17 AM   #13
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Quote:
Originally Posted by 06BOM6...View Post
And I'm gonna get a full alignment soon to see if that will fix it.

You may have to get the actual rear sub-frame aligned, which will not be done by an alignment shop. You have to find a GM dealer or local sponsor that has the rear sub-frame alignment jig, not all dealers have this special tool, calling around will save a lot of time.
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Old 12-04-2012, 08:41 PM   #14
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I get it now. Looking at the pictures, that is quiet a bit off.

As said, a 4 wheel alignment wont fix this issue, you need a cradle alignment done by certain dealers. Something is probably tweaked because the previous owner put the car into a curb or something.
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Old 12-04-2012, 08:49 PM   #15
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I was curious if this is something a cradle being off could cause. I have an alignment (and cradle) appointment set up for just after the new year. We'll see how that helps.


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Old 12-04-2012, 09:55 PM   #16
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Mine is the same. Yours may be a cradle algnment at this time. I have all the fancy new bushings and have had the cradle aligned, not once, but twice. It's just the way the subframe mounting points were welded in with the body, which is one reason I think folks were having trouble getting their subframe connectors to line up all prefect pretty. It's off and I doubt there is anything you can do about it. If you figure out how to fix it, let me know, it's been bugging the crap outta me for over a year.
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Old 12-04-2012, 11:21 PM   #17
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Must be a brazen orange thing.

Best bet is the rear cradle is off. When i put vmr wheels on my car (granted they were wider and with 275s) one side rubbed more than the other. Ground the lips off and got the rear cradle aligned.

I did full suspension as well but maybe some of the old bushings are causing this?
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Old 12-05-2012, 02:25 AM   #18
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Quote:
Originally Posted by Shift_GRIND...View Post
I'm confused by your post, but I don't think anything is wrong with your car...Are you just wondering why the rear wheels are sunk in so far? looks like both sides are sunk in the same, it's because the stock wheels are higher offset. You can push them out if you want, but about 6mm is the max to keep it hubcentric. Not sure how long the studs are, I have arps.

Or different wheels would push it out further.

False. With studs you can go further than that. Hub extends out 15 MM. There is a taper on the end which makes you loose 1 MM. There is also a taper on the leading edge of the wheel which makes you loose approx 1 MM. That leaves 13 MM. The way the 17's are made approx 3 MM of the wheel actually comes in contact with the hub bore. This leave an available 10 MM. So, according to these measurements you can do a max of a 10 MM spacer and still keep the same amount of hub extended in the wheel as the factory intended.

You could also get a spacer that is approx 15 MM that has a new hub bore machined into it to keep the wheels hubcentric.

http://www.ls1gto.com/forums/showthread.php?t=454485

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Old 12-05-2012, 02:28 AM   #19
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I have replaced all my bushings in the rear of the car. I have also used the cradle alignment tool. According to placing a straight edge across my fender and using a tape measure to measure to the same point of the wheel on each side my drivers side rear sits in approx 1/8 - 3/16" more than my passengers side. Strange thing is the front does the same thing on the drivers side.

Prior to the rear cradle alignment it was out more than this in the rear. It was at a point where you could see it from behind the car.
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Old 12-05-2012, 02:54 AM   #20
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I'm not even going out to look, ignorance is bliss.
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Old 12-05-2012, 04:09 AM   #21
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Quote:
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Mine is the same. Yours may be a cradle algnment at this time. I have all the fancy new bushings and have had the cradle aligned, not once, but twice. It's just the way the subframe mounting points were welded in with the body, which is one reason I think folks were having trouble getting their subframe connectors to line up all prefect pretty. It's off and I doubt there is anything you can do about it. If you figure out how to fix it, let me know, it's been bugging the crap outta me for over a year.

THIS^ mine is the exact same way. More in on the drivers side than the pass side. We are not the only ones either. Also, yes I too have all the fancy new bushings and aligned my rear cradle MYSELF with my own cradle alignment tool so I know for a face its on their straight. Not to mention with poly bushings there isnt even enough play in there for it to not be straight. My car however tracks perfectly straight down the road and doesnt have any weird tire wear issues. I've already chalked this up to poor quality assurance standards. Thats what GM gets when they have a car manufactured in a country thousands of miles away with an ocean separating them.

If you've checked it, its straight, and it tracks down the road straight.....dont worry about it. You'll be losing a lot of sleep over something you cannot change. Odds are you'll be the only person who notices it.
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Old 12-05-2012, 08:40 AM   #22
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Glad to see I'm not the only one. And the alignment is off up front a bit so I get some pull to the right. I'm going to see how it reacts after the wheel and subframe alignment and I from there. Drives like a dream otherwise. Well, besides riding like a skateboard.


Ill post up if there is any other issues that are found. Or if a fix is found anyway.


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Old 12-05-2012, 08:54 AM   #23
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Quote:
Originally Posted by 06BOM6...View Post
And the alignment is off up front a bit so I get some pull to the right.

A tire can give you a pull as well.
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Old 12-05-2012, 09:33 AM   #24
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I'm not even going out to look, ignorance is bliss.

Agreed I would literally kill myself getting it perfect hahha
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Old 12-05-2012, 12:16 PM   #25
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Quote:
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Must be a brazen orange thing.

Probably the real reason theDak never drove his

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Originally Posted by 01SS346...View Post
Agreed I would literally kill myself getting it perfect hahha

Agreed. You guys I am sure can imagine my deep disappointment after all the work I did with all new poly bushings in not only the cradle but the arms as well, harrop cover, everything. I did it all. After all the hard work, sat back with a beer from the other side of the driveway and immediately noticed that shit was off. I am more anal than most, and with a little pushing on one side and pulling on on the other, on the fenders and more the rear bumper cover where it meets the quarter panel, got it lined up pretty good. It's still a few c-hairs off though but I have to bust out a straight edge to see it now.
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Old 12-05-2012, 01:03 PM   #26
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I had to check mine. It's about 3/16" (5mm) more outboard on the passenger side. Or I could say 3/32" off center because that makes me feel better. That could easily be the body panels and is probably close enough for the Australian Air Force.

When one side sags more than the other, now that really buggs me.
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Old 12-05-2012, 02:56 PM   #27
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I will just put 7mm spacers on the passengers side and 10mm spacers on the drivers side. No one will be the wiser.
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Old 12-05-2012, 03:29 PM   #28
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Quote:
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I will just put 7mm spacers on the passengers side and 10mm spacers on the drivers side. No one will be the wiser.

Thats what I decided to do with mine after I get the new wheels.
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Old 12-13-2012, 11:23 AM   #29
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OP. I see this all the time with old Holdens around here (99 to 01). Just confirm if any maintenance has been carried out on the diff? If the diff. carrier bolts were loosened while the car is lifted, then re-tightened with the tires off the ground, this could easily happen! (for purposes of replacement of rear sub-frame bushings, rear sway bar bushings, diff. rubber bushing...etc)
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Old 12-13-2012, 02:54 PM   #30
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Both of our cars, the 06 and 04 have the same deal, the right side is out just under a 1/4 inch more than the left side on the rear. I have seen other cars the opposite and seen many cars perfectly centered. I stopped losing sleep over this along time ago.
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