On the casting tag on your Axle if it is a Dana 60 you will see 248 from 99-04 and 256 on the 05+ axle. Some of the control arm mounting locations are taller and wider then factory so modifications to the frame side arm mounts may be necessary . This will not work with the 3 link radius style kit that IRO has . You will need to convert to a True 3 link or 4 link setup.