Rear Toe In?? - TCCoA Forums

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post #1 of 8 (permalink) Old 02-17-2017, 07:55 AM Thread Starter
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Question Rear Toe In??

Had Firestone align it. Seems does wander a bit, but I'm not sure if that's just not an old system...

When I took it to Goodyear to get the caliper bolt off, they note the rear toe is not in spec.

I do notice when I stand near the rear wheels, they point inwards probably an inch at most. I found that really odd as no other cars of mine do that. Of course, they're all FWD's...

Do your Birds/Cougars also have a noticeable rear toe in?

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post #2 of 8 (permalink) Old 02-17-2017, 09:46 AM
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Well you can't really eyeball alignment. What you're seeing is the body tapering narrower towards to the rear end after the passenger compartment(teardrop shape is key to aerodynamics), giving the illusion of extreme toe in, when in reality it's minimal. If the tires and fenders were perfectly parallel from the top you'd have an extreme toe out condition.

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post #3 of 8 (permalink) Old 02-17-2017, 10:34 AM Thread Starter
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I'll have to snap a pic. I'm wondering if too much toe in can cause a noise at highway speeds.
Thanks for the response though!
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post #4 of 8 (permalink) Old 02-17-2017, 10:40 AM
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You do want some degree of toe in to compensate for bushing deflection, as the tires will slightly toe out from static when moving. Like I said though, pics won't prove anything, all of these cars have the back of the tire more visible from the back of the wheelwell than the front, it's even more exaggerated when you fit wider than stock wheels/tires
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post #5 of 8 (permalink) Old 02-17-2017, 02:47 PM
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Did firestone align all four wheels, or just the fronts? Our cars have adjustments at all four corners, and if you have a worn upper control arm bushing (common for our age/mileage) or worn toe compensators it can cause issues.

I take my car to a guy who does local dirt track racing (and wins like crazy), he's very good, and very thorough, and even better, will align it to the "aggressive" specs on our page.

My car does not wander on flat road, nor on regular roads even if they're turtlebacked. Yours shouldn't either.

I suspect either they didn't align the rear, or you have a worn component that they didn't realize needs replaced.

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post #6 of 8 (permalink) Old 02-17-2017, 03:45 PM
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One way to do a better job than eyeballing the rear toe is to use a piece of bright string:

The steering wheel should be centered so the front tires should be pointed straight.
Have one person (or just tie it off) at the rear of the car and extend it say 6-8ft. Make sure it touches the back of the rear tire (at the 9 o'clock position) and it long enough to indicate a spot on the back of the front tire.
When this nylon string touches the front of the rear tire (3 oclock position), your string will be pointing to where the rear tire is aimed at.

If the string just about touches the face of the tire, that means the tire is aimed at the right place. If you find that the string is aimed at the center of the front tire, that means things are toed-in.

It's worth checking if you are worried about it.

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post #7 of 8 (permalink) Old 02-17-2017, 05:43 PM
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Have you checked All the bushings?

The Upper Inner Control Arm Bushing is one that lets the top of the wheel tip in or out.

The Front and Rear Lower Inner control arm bushings are fairly compliant.

The stiffness in the rear arm is the "Toe Corrector", which bolts to the Lower Arm, and are thru bolted in front of the Front Bushing by its bolt.

Those will probably look "Blown Out" if they fail; mine had all the rubber shredded and pushed out.

Also, check the IRS to body bushings, they make the whole ass end sway under power and braking.

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post #8 of 8 (permalink) Old 02-18-2017, 08:30 AM Thread Starter
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Bushings all good. The only bad ones were the front UCA's

I saw the string test on youtube... gonna try that!

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