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Old 10-11-2006, 10:18 AM
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Ladder bar setup

I am installing a ladder bar rear suspension in my 57 Chev Truck. My question is in regards to the mounting point of the front spherical joint. A lever arm is created by joining the ladder to the axle and attaching to frame at some point.
The apparent length between axle centerline and theoretical point where the lever arm would contact the ground determines chassis reaction. What should be the theoretic lever arm length be?
I have seen some setups with approximately 40-60 inches ground contact point, ahead of the axle centerline. These were mostly racecars or hot street cars. I will use the truck for street use only. Can anyone give me a few hints? Thanks

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Old 10-11-2006, 05:32 PM
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I nabbed this off google real quick

Your suspension will be the same but instead of having an Instant Center (IC) where the links would meet if they were extended you will have a true center where the frame pivot point is. As you can see it is a function of not only length but also height and center of gravity location. Some people approximate the center of gravity at crank centerline or the top bellhousing bolt.
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