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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1566397" data-attributes="member: 30520">I mean it depends heavily on where you are sourcing your info from.   The drift/road course crowd will likely be well up in the 400 lb/in range.   Drag Racers tend to be more down in the 125-175 lb/in range.    Rear spring rates are all over the place because where you put the spring matters.  The further inboard, the higher the rate you want.  Moving to a true coil-over you will want less rate due to the mechanical advantage the spring has being place further out on the axis of rotation.  As you reduce friction and bind, change from rubber bushings to spherical bushings, you want to increase spring rates.  If you change from the 4-link to a 3-link panhard bar setup, bind reduces dramatically and you want to increase rear spring rate. Really the entire suspension needs to be thought of together as a full system.  The rear axle control arms themselves act as a spring and what control arms you run come into play with regards to rear spring rates.  Theres a good sticky at the top of the forum regarding the MM roll bind study.  Needless to say, i had hours and hours of research into my setup before I bought a single part.</blockquote>