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Old 04-07-2010, 6:18pm   #1
Toque
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Default Rear tire stick out more on one side than the other ?

Guys:

Just wanted to let you know about an experience I recently had. Maybe it can help you out.

I have owned my 2004 C5Z06 for 6 years now. I got it new. When it was new I noticed that the drivers rear tire stuck out 1/4" more than the passenger side. It was not that noticeable so I did not worry about it. I added my wider 11" CCW's that stick out just a little on both sides. That's when I really noticed the extra 1/4". I did not like it but it was not hurting anything so I left it alone.

Recently after I added my Coil overs I started to notice a little bit of tire shine on the inside of my rear fender. With the coil overs longer travel my tire was touching my inner fender lip. Now this issue got my full attention. I did not want to damage my rear quarter for sure. I started to search around about this issue and found very little. I then found a post in the C6 Z06 section about my exact issue. He has a new C6 Z06 and the dealer said they can not fit it. I thought that sounded like complete BS.

In that post there was a fellow that said he fixed his car. I started to PM him about the issue, and how he fixed his car. Thanks to him I got my rear set up so that my drivers side tire only sticks out a little over 1/32" more than my pass tire sticks out. It was 8/32" before I fixed it. This should cure my inner fender rubbing too !

I found out that the rear cradle has alignment pins press fitted into it. The alignment pins insert into the frame during assembly as they mount the cradle to the frame. What I found out is that the hole in the frame that the alignment pins insert into are TWICE the size of the alignment pin itself ! No wonder all of our car's are a little different.

This is an issue on C5's and C6's....

What I did to fix my issue:

1.) Raise the rear of the car with jacks on both sides (not under the back lifting the rear cradle). Place jack stands under the car for safety.
2.) Remove the 2x bolts holding the rear diff to the cradle. (re-tighten to 37ft/lbs after).
3.) Loosen the 4x bolts holding the cradle to the frame (re-tighten to 81ft/lbs after). Let the cradle down approx 1/4" or so.
4.) I was then able to use a pry bar to push the cradle to one side that got me to the position where I wanted it. Measure the wheel distance on both sides frequently to see your progress.
5.) Try to make sure you push the cradle over straight. Measure to make sure one side wheel is not pushed to the front of the car, where the other side towards the back of the car. Keep everything as square as you can.
6.) Note... I'm not sure I understand the logic in this, but to make my drivers tire move in towards the center of the car, I had to push my cradle towards the drivers side. Don't ask me why... I don't know. haha. I just know it worked.
7.) R2e-tighten your 4x cradle bolts to 81ft/lbs, and re-install your 2x diff bolts and re-tighten to 37ft/lbs.
8.) Lower your car, and verify your changes.
9.) Get an alignment ! ! !

Hope this helps someone !
Toque

I got this information from another member about how the cradle moves (see my question above in #6)
The top of the spindle(and hub) is connected to the frame with the upper A arms.
The bottom of the spindle is connected to the cradle with the lower A arms
When you pry ed the cradle over, you actually moved the lower a arm out which moves the top of the wheel in.
Vice-Versa on the other side

Toque
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Last edited by Toque; 04-08-2010 at 8:20am.
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Old 04-07-2010, 6:36pm   #2
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Good Info, appreicate you sharing.
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Old 04-07-2010, 8:59pm   #3
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Strange... I've had mine out before and there was little to no play in it when it went back in. Maybe they got sloppier w/ the frames in later years
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Old 04-07-2010, 9:03pm   #4
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Quote:
Originally Posted by Cobra4B View Post
Strange... I've had mine out before and there was little to no play in it when it went back in. Maybe they got sloppier w/ the frames in later years
Some alignment pins are bigger than others I suppose...
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Old 04-07-2010, 9:04pm   #5
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Hey man it's all how you use it.... you seem to be doing just fine
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Old 04-07-2010, 9:14pm   #6
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That's a pretty cool tip. Thanks for posting it up and glad you fixed yer problem.
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Old 04-08-2010, 7:59am   #7
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Quote:
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Some alignment pins are bigger than others I suppose...
Hum...........I know my 97's like the back of my hand, only 1 set nice & tight to boot and the tires......always been equal
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Old 04-08-2010, 8:20am   #8
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I got this information from another member about how the cradle moves (see my question above in #6)
The top of the spindle(and hub) is connected to the frame with the upper A arms.
The bottom of the spindle is connected to the cradle with the lower A arms
When you pry ed the cradle over, you actually moved the lower a arm out which moves the top of the wheel in.
Vice-Versa on the other side

Toque
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Old 04-08-2010, 2:27pm   #9
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i notcied one side of the rears sticking out farther then the other one day and relized that when i had all the wheel off to polish up prior to a show i might have swaped sides... so i swapped the rears and sure enough, the both stick out the same distance now... thought that was weird.
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Old 04-08-2010, 2:47pm   #10
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Quote:
Originally Posted by illmac77 View Post
i notcied one side of the rears sticking out farther then the other one day and relized that when i had all the wheel off to polish up prior to a show i might have swaped sides... so i swapped the rears and sure enough, the both stick out the same distance now... thought that was weird.
Its just you Mike...

I swap my wheels from side to side to help even out tire wear. My tire always stuck out more on the drivers side. Same with my stock Z06 rims. The cradle alignment pins have such a large hole in the frame to go into.
I'm not surprised that everyone's car is going to be different.
There are a bunch of folks in other forums coming out that have this issue.
Some are saying there pass tire sticks out more, and some there drivers tire sticks out more.

Some have said that maybe its the body that's not lined up straight. That could be true for sure. I just don't know how to change that.

PS... We need to get the "twins" together this spring/summer.

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Old 04-10-2010, 12:32am   #11
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yep...im crazy!! but def, we are going to hang out alot more this year... we need more cruises then shows...
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Old 04-13-2010, 6:39pm   #12
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Checked about 40-50 at the Waterside Show Saturday and I was amazed ! Almost all had a spacing offset and every one that did was shifted to the driver's side....Go figure
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