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How can I lift my Quadravan?
Lifting the coil spring Quadravan can be done as long as the geometry of the front axle remains the same. You must drop the radius arm drop brackets and the track bar mounting point at the engine cross member to match the increased height of the lift spring.
If you do not want to lower the radius arm drop brackets, you can cut and reweld the front radius arm to axle housing brackets which are welded to the axle housing. It may also be necessary to cut and reweld the yokes on both ends of the axle housing to regain some of the axle geometry. Without these modifications, the taller spring will allow the pinion to rise and some of the caster and camber settings will be reduced. The more you lose, the more unstable the steering becomes. The steering would be erratic and would wander badly on the highway. The same instability you have when driving fast in reverse.There are some alignment tricks that will help, such as offset upper ball joint pre load screws and spindle shims, but these are only good for minor adjustments.
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