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Another possible option is the metal tech 4x4 rear coils. They are the only ones I've seen that are progressive, they are softer and stiffer than stock depending on load. These look promising, but I don't know of anyone using them.
Hey everyone, I Have a 08 Fj and an 09 Runner.
I...
I am very interested to know if this works too! I too have an 08 fj and a 00 4runner and I want to do the same thing.
Hope someone has some info for us