HOW TO MEASURE YOUR LEAF SPRING
A.) Follow the curve of the spring, measuring from the centre of the front eye back to the centre bolt
B.) Then, measure from the centre of the other eye back to the centre bolt. It could be something like, “735mm x 665mm” depending on your measurements and centre bolt location.
C.) Measure the camber of the spring by measuring from the line created by the straight edge to the main plate right next to the centre bolt.
Note the configuration of your leaf springs by counting the leaves. Start with the main (top) leaf, and count the number of leaves in first stack of leaves. (For example, 4 leaves.) Then count the number of rebound leaves—these are normally larger leaves separated slightly from the main stack of leaves. (For example, 1 leaf.) The illustration below shows a "4+1" leaf spring with an eye on each end.
Leaf springs act as a cushion between the axle and chassis to protect your vehicle and cargo and support weight. Sagging, cracked or worn out leaf springs can cause numerous problems with the ride and handling of your vehicle.
It is recommended to always change your springs in pairs and do not reuse u-bolts. Make sure that new u-bolts are installed and torqued to proper specifications. Recheck torque after a couple weeks of service.