4th gen front and a 3rd gen rear, best tip is take down your spare tire, give you more room to work. i jacked it up from the pumpkin, put jack stands under the cab, and pulled the wheels while it was in the air, then let down the jack so the weight of the axle gave a little bite on the bolts. unbolt the bottom first using a 13/16's wrench and a t55 torxs, then tap the bolt out a little so you can get a grip on the head. used the jack to releave tension while pulling on the bolt, and pull the bottom bolts out. then jack the pumkin up until the leafs spring eyelet is touching the bottom of your bed.then grab the t55 torxs and an extension, slide it over the frame and into the bolt on top, tab the bolt out, install in reverse