rear end lift.

[Jeff65]

Shackle kits are a poor way to get lift. Although they space the leaf spring, they also cause it to flatten with time. Any benefit you start with will soon disappear. Its much better to get a set of new springs with the characteristics you want. You can get shackle kits at Mustang vendors but for the large part these are stock replacement kits. If you want a specialty kit, see your local spring rebuilder/restorer. You'll find one of these shops in most larger cities.