No, absolutely do
not put power steering fluid in your 2004 Malibu Maxx's transmission. Power steering fluid and transmission fluid are completely different fluids with different chemical compositions. Mixing them will severely damage your transmission, likely requiring a very expensive repair or even replacement.
If you need to add fluid to your transmission, use only the type of transmission fluid specified in your owner's manual. The manual will also tell you how to check the transmission fluid level and the proper procedure for adding fluid if needed. If you're unsure, take your vehicle to a qualified mechanic.
