You will need a puller if you are going to replace the axle bearings. Also, buy new fluid, gasket and friction modifier because you will have to pull the cover. To rempove the axle you have to disassemble you brakes, then remove the rear cover. There is a small bolt on the diff case that holds in the cross shaft. Remove that, push in slightly on the cross shaft, turn the case around and pull it out from the other side. Sometimes the pin will be hard to pull on from being slippery, if so push out the side that had the lock bolt in it and insert the lock bolt back in to use as a handle. Then just slide in the axle slightly and remove the c-clip from the center of the diff case, a magnet makes this part easier and comes in handy from reinstalling. Then just slide out the axle. Installing is the exact opposite. I would replace the axle bearings while you are in there, along with the seals, unless it has very low miles. The old bearigs and axles wear together similar to a brake pad and rotor, although not a severe.