I plan to change my differential oil this week. I know the gasket is reuseable, but do I use a sealer with the gasket or just clean the housing and the cover and just the dry gasket?......Also Iam using Valvoline Synthetic do you open the fill plug and pour it in or do you use a hand pump.

 

Just clean and reuse, is what I did.

 

same here... you should be fine.