Icon Vehicle Dynamics Suspension Question: What is the true issue with stacking lift blocks?

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Icon Vehicle Dynamics Suspension Question: What is the true issue with stacking lift blocks?

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You hear the adage dont stack blocks thrown around all the time but few actually understand the fundamental issue. When lift blocks are added the distance from the spring to the axle is increased. This increased distanced provides greater leverage working against the springs and more importantly the u-bolts. The steel from which the u-bolts are manufactured will provide a given amount of stretch per inch. Therefor the longer the u-bolts the more potential stretch. The leverage applied to the u-bolts and the potential stretching of the u-bolt material are both relative to the distance from axle to spring. Again, the leverage is relative to the distance, not the number of blocks. It is the leverage which causes u-bolt failure. And, it is the failure of the u-bolts which causes blocks to be spit out. It is easy to blame the blocks when they are sitting out on the ground but if the u-bolts did not fail the blocks could not have come out. Therefore the bottom line is keep the leverage to a

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