What are the pros and cons of blocks, add-a-leafs, or leaf springs?
A. Lift blocks – Blocks simply space the springs away from the rear axle and are the most economical way to lift the rear of a truck. Ride quality and spring strength / flexibility are unaffected because the stock springs are retained. However, blocks will increase the springs’ tendency to wrap-up when under hard acceleration and load. Trucks that are good candidates for blocks must already have satisfactory spring strength, must not be used extensively for heavy hauling or towing, and are not already equipped with tall factory blocks. Add-a-leafs – Rear add-a-leafs, commonly used in conjunction with blocks, are a good lower-cost alternative to replacing the stock rear leaf springs. They combat spring / axle wrap-up by beefing-up the spring and reducing lift block height, or by eliminating blocks altogether. Both full-length and overload replacement types are offered (see add-a-leaf application charts for more information). Add-a-leafs do increase rear spring rate, so the rear of the v
