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Old 01-06-2006, 01:14 PM
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4 Link rear suspensions

I've started an upgrade to me 57 tbird. The biggest and most radical change is a 4 link fixed rear axle with coil over springs from Comp Eng.
The suspension needs to be aligned - front and rear. The front end is from a '70 full size ford and is aligned in the same way as the original tbird.
The rear end is going to take extra care. There are two links on the top of the axle that angle inward and forward; and two links on the bottom of the axle that are level and pointed straight to the front.
How do these two sets of links work with each other?
And what are the critical adjustments?

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Old 01-06-2006, 01:17 PM
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Welcome to Hotrodders. This forum is for introductions. You should post your question in the Suspension forum....you will get better response that way.
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Old 01-06-2006, 06:02 PM
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moving it there.
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Old 01-06-2006, 08:30 PM
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You have what is called a "triangulated" 4link. The angling of the upper link means that you don't need a Panhard rod to control side-to-side motion of the axle assembly.

It's important that the forward ends of the upper links be as close together as possible to avoid binding.

The lower links do not have to be "level" (parallel to the ground). To avoid squatting or rising of the rear of the car during launch, it is only necessary that lines through the upper and lower links, when viewed from the side, intersect on an infinitely long line that passes through the rear tire patch and the intersection of two other lines, one a horizontal line through the center of gravity and the other a vertical line through the front tire patch (the further forward of the rear tire patch, the better). Since parallel lines meet at infinity, one option is to have upper and lower links parallel to each other and to the line which I have just described (the one that passes through the rear tire patch). If the intersection of the link lines is above that line, the car will rise on launch; if below, it will squat.

Sounds like quite a project. Evidently, you're going to be taking it to the dragstrip or you would have stuck with the stock setup. Hope this helps. I would also recommend that you search this site for other threads on triangulated 4links.
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