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Hello Ron,
It is critical to bushing longevity that you use the correct tightening procedures when installing original style rubber suspension bushings that have a center sleeve that is bonded to the rubber. FYI, there may some poly bushings that have been bonded to the center sleeve.
When you tighten the fasteners on this style of bushing, the center sleeve is locked in position. Some of the bushings even have center sleeves with serrated edges that help hold the sleeve when tightened. When the fasteners are tighten with the weight on the wheels, the rubber inside the bushings will be in their neutral position without being twisted.
If you tighten the fasteners with the wheels hanging, the rubber inside the bushings will be partially loaded when the car is on its wheels and that can raise the car. But more importantly, when you drive the car with the bushings incorrectly tightened, you over stress the rubber when the suspension is compressed which will reduce their life span of the bushings.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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