Thread: Proper spring rate for my 34 3 window

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On a Mustang II type suspension, BOTH A-arms should be parallel to the ground. That's the way Ford designed it. However, many IFS manufacturers have lowered the upper pivot point in order to clear the fenders on fendered street rods. If you have one of those, at least make sure that the bottom A-arm is parallel with the ground.

If I were you, I'd call the shop where you're buying the coil-overs and give them the info. You might want to call Pete and Jakes. The Slovers are very helpful, and they sell very good coil-overs. You might want to call Outlaw also. It's their body, and they should be willing to pass out the info.

Here's some good reading:

http://www.heidts.com/heisinfo.htm#bump