These are 300# springs that work best on The Acty due to how the Unibody distributes it's weight. You should get about 3/4 to 1 inch lift in the front that removes the stock rake, provides a little more room for larger tires and provide a much better feel. Although "stiffer" when hitting those driveway curbs etc you don't get that bottom out feel like you do with stock. A simple and fairly inexpensive modification that you will appreciate every time you drive your truck. These springs don't have a flat side and fit perfectly into the OEM perch unlike other brands. Fit all HA-1/2/3/4 trucks and HH-1/2/3/4 vans