1. Remove the rear differential. 
2. Remove the rear differential side oil seal using a ST or screwdriver wrapped with vinyl tape to prevent the side retainer from scratching.
| ST 398527700 | PULLER ASSY |
3. Using the ST, install the oil seal to the side retainer.
• T-type
| ST 398437700 | DRIFT |
• VA1-type
| ST 498447100 | INSTALLER |
4. Install the rear differential.