How do you add fluid to the rear end on 2005 Toyota Highlander?

To add fluid to the rear differential of a 2005 Toyota Highlander, first, locate the fill plug on the rear differential housing. Use a wrench to remove the fill plug and check the fluid level; it should be just below the plug opening. If needed, use a fluid pump to add the appropriate differential fluid until it starts to seep out of the fill hole. Finally, replace the fill plug securely.