Whats the correct way to measure spring lenght???

[Supreme70]

I measured the spring eyes on the frame and came up with 52", should I measure springs them self???? I have a short bed truck and Im putting a ord shackle flip with the 6 inch shackles and I want the best flex I can get. So should I get longer springs and use the zero rate or just run what I have????

 

[dremu]

The measurement bandied about is for stock springs, along the arch of the spring, from eye center to eye center.

56"s in the back can give you crazy flex; to do this you'd just swap the shackle flips left-to-right.

I used a set of 56"s from a one-ton with nine or ten leaves, but took some off, as stock springs that thick don't flex for crap

-- A