How do you change axle seal on a 2002 hyundia elantra?

You have to pull the entire axle. Take off the tire and wheel hub. unbolt the tie rod from the wheel hub. unbolt strut assembly from wheel hub. Pull transaxle drain plug to empty as much fluid as possible. Use a pry bar to remove the right side drive shaft from the transaxle. Note that some fluid will still leak, despite having drained the transaxle. use a screwdriver to remove the old seal. Moisten new seal with fresh transaxle fluid prior to installing. Install new seal with a seal installer tool and mallet, by gently tapping it into place. Reinstall axle by following steps in reverse order. Don't forget to replenish transaxle fluid with SPIII fluid!