They work fine for what they are designed for. They are designed to allow for more front end lift on acceration which allows for more weight transfer to the rear wheels on launch. In their day, they were the answer. With the advent of all the good four bar rear suspension systems allowing for so much more adjustability, they have become pretty much old tech. On a leaf spring rear car they still work fine, they will allow more front suspension travel, better weight transfer, and better hook on the rear. Because they are not on the load bearing side of the suspension, they have nothing to do with ride height.....