3" are too wide - these truck have 2.75" wide springs. The only person that ever sold add a leaf kits the right size was John Baker, and those have not been available for over 20 years. Rancho sells an add a leaf for these trucks with a 2" lift, but they are 2 1/2" wide. There are spring companies out there that make custom springs, check the sway away posts for contact info.