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· CheeseBurger Milkshake!!
3,838 Posts
I don't know of a site, but I did some homework on the subject a while back:

Stock fr:410lb/in---rear:275lb/in

Most manufacturers 2" lift is the same as stock

4" lift fr:560lb/in--rear:stock
6" lift fr:580lb/in--rear:stock

Rancho never gave me a straight answer on spring rates.
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