The following oil seals can be replaced without removing the transmission from the car. For the speedometer gear seal, raise the vehicle for access beneath and set it firmly on stands. Disconnect the speedometer cable, remove the lockplate to extension bolt and lockwasher, then take out the lockplate. Use a screwdriver to pry the fitting gear and shaft from the extension, and then pry out the O-ring. Installation is the reverse of removal; lubricate the new seal with transmission lubricant and ensure the slot in the fitting is towards the lockplate boss on the extension. For the extension oil seal, first remove the drive shaft and any ancillary items necessary for additional clearance. Carefully pry out the old seal, clean the counterbore, and examine it for any damage. Pre-lubricate between the lips of the new seal with transmission lubricant and coat the outer diameter with a suitable sealant. Install the seal with the lips inwards until the flange seats, ideally using a tubular spacer for this job. Finally, reinstall the drive shaft and any other ancillary items that were removed.