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Old 12-20-2012, 11:09 PM   #1 (permalink)
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Default alignment puzzle

69 mustang coupe. The pass side lower control arm is adjusted max and cant get it to align. Tire leans in too much at the top, eccentric bolt is adjusted to the max, the mechanic and I looked it over for about 40 min comparing both sides. No resolution, nothing obvious, I done a little measuring myself.

Export barce.....check
MC bar......check
ball joints....check
bearings......check


I there a possibility the wrong CA's were installed. I mean will another year fit. Because these were put on not too long ago, as they are still pretty clean with stickers on them. He told me he could shim the UCA a bit but 69 isnt supose to have them. He also said that it was raked up way high and he thought it had big block springs under it?

Took it to a body and frame guy, he mentioned the springs also.

Anyone got an idea?

Thanks,
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Old 12-20-2012, 11:24 PM   #2 (permalink)
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Pictures......tape measure?
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Old 12-20-2012, 11:26 PM   #3 (permalink)
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Well, first thing is what are your alignment angles at right now? I would check the eccentric on the lower arm and make sure the tabs that the eccentric rides on are not bent out, not allowing the control arm to pivot. Did he check for a possible bent spindle? Kinda hard to say what's wrong without actually seeing it.

Last edited by cmefly; 12-21-2012 at 12:54 AM.
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Old 12-21-2012, 12:15 AM   #4 (permalink)
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If the top of the tire is leaning out, you have positive camber. Adding any shims is only going to add even more positive camber. Maybe some one already added shims? Check the UCA and frame area for problems too.
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Old 12-21-2012, 12:25 AM   #5 (permalink)
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Measure the distance on both upper control arms from the outer ball joint into the shock tower wall. You might have 2 different upper control arms on the car. Might've been in an accident prior to you owning it and someone replaced it with who knows what upper control arm.
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Old 12-21-2012, 05:38 AM   #6 (permalink)
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quick fix is shim it-finding out why is tough unless u want to spend big bucks and lots of money to correct to factory specs. prev accident or shock tower cracking is normal causes on a rust free unibody.
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Old 12-21-2012, 10:27 AM   #7 (permalink)
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I know for a fact its had a hit in the rear. I have measured the distance between the pivot bolt holes on the LCA. Center to center is about 19 1/8.

Shock towers measure about 33 1/2 at the center of the shocks.

Based off these number and my research, they are good.

I would think if the frame had a twist, the car would not set true. I have measured the fenderwell molding to floor distance on the front and they are the exact same height.

as of now the camber for the pass side is at -1.90 with no more adjustment. I can def see the tire lean in at the top.

I will get pics soon.

Mike
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Old 12-21-2012, 10:29 AM   #8 (permalink)
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Quote:
Originally Posted by HoustonGlock View Post
Measure the distance on both upper control arms from the outer ball joint into the shock tower wall. You might have 2 different upper control arms on the car. Might've been in an accident prior to you owning it and someone replaced it with who knows what upper control arm.
I will check that, I wasn't sure if another year would even fit on a 69.

mike
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Old 12-21-2012, 10:29 AM   #9 (permalink)
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Still need to measure the depth of the upper control arms. The 65-66 arms are shorter and may have been substituted on the side with the lean in - measuring from the upper balljoint to the shock tower will show if the distance is the same or not.
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Old 12-21-2012, 11:28 AM   #10 (permalink)
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Quote:
Originally Posted by HoustonGlock View Post
Still need to measure the depth of the upper control arms. The 65-66 arms are shorter and may have been substituted on the side with the lean in - measuring from the upper balljoint to the shock tower will show if the distance is the same or not.
The early 65/66 Upper control arms would be difficult to install on the 67+cars. But yes, you would still want to measure them.
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Old 12-21-2012, 11:39 AM   #11 (permalink)
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Just like a compression test is a basic indicator of engine condition, a 4 wheel thrust angle alignment will tell you if your front & rear are out of line, and a SAI (steering axis inclination) reading will tell you if you have something bent or improperly installed.
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Old 12-21-2012, 02:09 PM   #12 (permalink)
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Quote:
Originally Posted by cmefly View Post
The early 65/66 Upper control arms would be difficult to install on the 67+cars. But yes, you would still want to measure them.
Nearly impossible...65/66 UCA mounting bolt spacing 3.75", 67-73 UCA mounting bolt spacing 4.75"
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Old 12-21-2012, 02:20 PM   #13 (permalink)
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Would it be possible to use the 67-70 shaft arm on a 65-6 a-arm assy? I've seen some mixed parts working on these cars thru the years........
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Old 12-21-2012, 04:54 PM   #14 (permalink)
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I'd much more suspect the LOWER arm.
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Old 12-21-2012, 05:14 PM   #15 (permalink)
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I tell ya guys I have checked, measured, compared, and most I can find is a difference of maybe 1/8. That 1/8 was measuring the from top of the spindle to the frame. I wonder if the axle part that the tire runs on is bent up.

If I measure the from LCA brackets to my shop floor the measurements are exact. Disproving the frame maybe rolled or lower on the pass side which would kick the bottom of the tire out.

It has the export brace and a MC bar.

If I measure the LCA lengths, measurements are the same.

The UCA lengths are the same.

If I measure the top of the spindle to the frame, measurements are the same.

As mentioned earlier, the distance between the pivot holes on the LCA is in spec.

So why on earth would the tire lean in at the top when the drivers side isn't with all things equal?

The only other area is the shaft that the wheel rolls on I guess.

Mike

Last edited by mikek69; 12-21-2012 at 05:17 PM.
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