Add-A-Leafs are a simple and economical way to get a small amount of lift from a leaf spring equipped vehicle. Add-A-Leafs come in long and short versions. The longer spring is usually installed under the main leaf and gives a better ride than a short add-a-leaf. The short version is installed under the main pack, but on top of the overload, and usually stiffens up the ride more than the long leafs.
Add-A-Leafs are also a great cure for sagging and worn springs. Depending on the spring and the vehicle, you can normally count on 1.5-2" of lift from an add-a-leaf.