[Bill Douglas]

Always replace both. If they are on the drive end of the car the diff/transaxel will be constantly working because of the different circumfrences (spelling?) A friends BMW threw up warning lights all over the place because he had a worn spare on the front so the car. Half of the cars computing thought the car was turning because of more rotations on one side, and the other half of the computing said not, so it said problems goto sickbay.