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I see that Westcott used a preload collar lift (pre-collar lift) on their 4Runner build and thought this was the same as a spacer lift kit. Turns out they're not the same.
A pre-load collar lift adds preload to your existing suspension springs by using a collar, effectively lifting the vehicle with minimal changes to the suspension geometry.
More specifically - like a coilover, it puts more preload on the spring, retains factory travel, still uses factory bump stop (doesn't take all the force on factory shock), and doesn't bottom out prematurely. It also helps redice dive and body roll.
Here's how Westcott explains the difference:
A pre-load collar lift adds preload to your existing suspension springs by using a collar, effectively lifting the vehicle with minimal changes to the suspension geometry.
More specifically - like a coilover, it puts more preload on the spring, retains factory travel, still uses factory bump stop (doesn't take all the force on factory shock), and doesn't bottom out prematurely. It also helps redice dive and body roll.
Here's how Westcott explains the difference:
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