I replaced both cylinders on my rear because I would fill the reservoir and the next day it would be empty, sitting in my DRIVEWAY! Make sure you have a good amount of brake cleaner, PB blaster on the 2 bolts next to the brake line and the brake line fitting itself at least 4 hours before. I have a full floater rear end, so I will tell you what I did and if you have a full floater then it will help you, if not, then maybe someone else can. I found it easier to jack up both rear tires with jack stands under the axle (but if you do one at a time you can keep your gear oil from leaking out too bad). Unbolt the wheel and set aside. Then, unbolt the 8 bolts on the hub of the floater and tap with a dead blow to break the seal loose. Slide the axle out of the axle housing and sit it aside, try to make sure no dirt gets on it. Grab a fairly large flat head screw driver and a dead blow. If you look inside of where the axle slid out, you will see a large hex nut with metal tabs keeping it from turning. Bend the taps out towards the outside of the axle housing so it will let the hex nut spin. If you have a socket big enough to turn the nut, use it. if not, place the tip of your flat head against one of the points on the hex nut and tap the screw driver with your dead blow to loosen the nut. unscrew the nut all he way and set it face down on a rag or something (so that when you go to put them back on, they are in order of what goes on first). If I remember correctly, there is another nut behind that one. remove that nut the same way. now, you should be able to remove your brake drum. Make sure the parking brake is released and pull the drum towards you. You may have to tap the back side of it with a dead blow or hammer to bump it loose. Once the drum is removed, I would take a picture of the brake show assembly for reference. Begin with pulling off the springs, starting with the one closest to the outside. On the brake shoes, you will see one round, slotted disk with a spring behind it and a pin through it to the back side of the plate on both shoes. with a pair of vise grips or channel locks, grab the outer edges of the disk, push it away from you, and spin it so the slot lines up with the wedge on the pin, releasing it. Remove the shoes, then pull the 2 pistons out of the sides of the brake cylinder. Remove the bolts from the back of the cylinder, and the brake line and then swap the cylinders. Reverse order everything and you should be set. Hope this helps!