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Originally Posted by metal-zook-mulisha
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I am sorry that you are not getting a direct answer to your question, metal-zook-mulisha.
The answer is four - one for each spring perch.
As others have said, lift blocks are not very safe for offroading as there is a lot of stress applied on the axle/spring attachment point during suspension flex and the application of large amounts of power.
Creating a space by installing lift blocks creates increased leverage between the spring and the axle. Violent application of power or impact with a rock can make the suspension to flex dangerously resulting in spring wrap which distorts the leaf springs and also damages the u-joint on the differential end of the wrapped axle.
I see these type of lifts all the time on full-sized US Pickup Trucks that never look like they have ever left the pavement in their lives. The second one of these owners/drivers goes offroad and really mashes the motor going over and obstacle, he/she is in for a world of hurt.
The best suspension lift is either a set of lift springs, a Spring Over Axle (SPOA) lift or a Virtual lift (cutting the wheel well sheetmetal to gain clearance for larger tires). These are infinitely safer than lift blocks and get the job done!!
I hope that this helps!