If your just adding in an add a leaf to your existing pack, there is no need to remove the leaf pack via the front and rear bolt that go into the unibody. Jack up rear end, place jack stands under unibody, remove jack, remove wheels, and do one side at a time. Whatever side you start on, place your floor jack under the drum, end of axle, or shock mount. Pop the shock off the lower mount. Remove the 4 nuts (per side) holding the u-bolts on. Remove the u-bolts, once the u-bolts are out and the shock is disconnected, slowly lower the floor jack which will let the axle droop. Watch the brake line to make sure you dont snag it. Lower the axle enough to where the leaf spring center pin pops out of the axle perch and keep lowering it until you have a few inches of clearance between the axle perch and the bottom of the leaf spring pack. Once you do, take your c-clamp and clamp the leaf pack towards the center. Then take a vise grip and get a solid grip on the bottom of the leaf spring center pin (its like a bolt, the bottom is rounded and sits in the axle perch). With the bottom of the center pin secure, take a wrench and remove the top nut. Once thats done pop the center pin out and slowly unscrew the c-clamp. The pack isnt under a ton of pressure but if you remove the center pin without a clamp it could jump and hurt you. After the c-clamp is removed, all the leaf springs other than the MAIN LEAF will come out. For adding an add a leaf you dont have to pull the main leaf that is bolted to the unibody. Next add your add a leaf into the pack, typically towards the center/ between the top and bottom leafs, then check your friction pads. The friction pads are little plastic circles or squares that go at the ends of the leaf springs. They keep the leafs from rubbing and making noise. I did a lift kit on an xj and cut up an antifreeze container and made frictions pads with the plastic. After that, put the leaf pack back in place, clamp the pack tight, pop the center pin through (may need a longer center pin due to increased pack thickness after the add a leaf, I went to the hardware store and got a grade 8 allen head bolt since the allen head bolts are rounded and fit into the leaf perch). Once the center pin is in and the nut is tight, take the clamp off and put it towards either end of the pack in order to compress the leafs to where you can add in your metal leaf spring clamps. Typically one on each end. After that, jack the axle up and make sure the new center pinch goes into the center hole on the perch, pop in the u-bolts and I believe torque is around 65 ft. lbs. Hook up the bottom shock, check everything over, put the wheel on and your good.