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Re: Airbags with a straight axle
Four link suspensions are built with varying degrees of travel. Technically your '64 Chevelle has a four link on the rear. GM placed the upper arms at an angle and connected them near the center of the axle through bushings to allow the axle a greater range of rotation.
The system in the pictures is not going to allow large range of axle rotation. This may be intentional. The builder may not expect much suspension travel and may believe axle twist is not too likely. There are Heim joints on one of the arms and will allow for some motion. I haven't followed his thread nor have I spent much time looking at the photos to see the final product. I would not expect a small amount of twisting to damage the forged axle. I would expect that roll resistance would affect ride much as a sway bar would. Driven mildly that system might be good for many years. In my hands it might not last so long.
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