Abstract: A tool is described for mounting and demounting splined joints, especially those found in the front-wheel drive assemblies of cars. A special tool is provided which can be inserted into the internally splined wheel hub rotatably fixed to the vehicle and which screws on to one end of the externally splined drive shaft portion being installed in the hub. The other end of the tool mounts to a slide hammer. When the slide hammer weight is banged against the tool or against the oppositely located hammer stop, the momentum impulse is transmitted to the splined shaft to push it out of or into the splined wheel hub, depending upon the direction of movement of the hammer weight. The tool is successful even with interference fit splined joints otherwise requiring large press forces for assembly or disassembly.