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Old 08-08-2009, 06:25 PM
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Shackle angle?

I have a ’69 Mustang… it rides like the rear axle is welded to the frame. I took a look at the springs and the shackles are angled all the way back so they are sitting on the frame… I got a new spring and shackle kit and it’s doing the same thing (a little improvement actually, but not much). Unless I’m missing something, aren’t the shackles supposed to be in a relatively straight up and down position to allow for flex either way. Ideas?

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Old 08-08-2009, 06:34 PM
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Sounds like the leaf spring is too long or has an incorrect arch. How's the ride height?? Good springs, and Mustang specific, or generic?? Are springs de-arched lowering springs??
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Old 08-08-2009, 06:38 PM
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Height is good, the springs are specific for that car (from CJ's Pony Parts). I originally thought the springs were from another car, but the new ones are doing the same thing... I'm stumped... it's not like the car got shorter.
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Old 08-08-2009, 07:07 PM
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I'd call CJ's Pony and see what they say, it's their spring.
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Old 08-09-2009, 02:48 PM
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The spring measures correct.
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Old 08-09-2009, 05:32 PM
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something is really wrong with the setup. The shackle should be slightly back (almost a 45 degrees) from the frame. I would measure another mustang for arch and length.
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