Remove the negative cable from the battery and this need to be done in a place where it cannot come into contact with the negative terminal on the battery. Lift the car and secure it on the jackstand in such a way that it has been supported at all the four ends. First, slide out the rear pipe and the attached catalytic converter, unbolt the heat shield of the converter and take it out as well. Next, remove the driveshaft. Regarding this, using a long screw driver to remove a seal while being gentle on the output shaft of the transmission housing, you can also use a sheet metal screw to help in driving out the seal. Before installing the new seal, immerse the lips of the seal in gear oil, then apply the sealant to the outside diameter of the seal, reverse end of the case, with special tools used for the installation of the seal through the use of socket or pipe. Last of all, the installation process simply entails the reversal of the removal process outlined above.