Just picked up a set of front coils from a wrecked XJ. It was lifted, but not sure how much. Got the coils for 40 bucks, couldn't pass it up. They measure 21.5" uncompressed. Anyone know what size lift these are associated with?

 

Unfortunately, the material and thickness will effect the spring rate. Different manufacturers use different rates, so the uncompressed length will vary by spring.

The best thing to do is throw them on and see how much lift it looks like

 

The uncompressed length wont tell you lift height.

So unless you see a part number on it, the only way to tell is to just install them