A 1966 Dodge Charger with a 727 TorqueFlite transmission should use
Type F automatic transmission fluid. However, it's crucial to note that modern Type F fluids are often formulated differently than those available in 1966. While you *can* use a modern Type F fluid, many mechanics and enthusiasts recommend using a
high-quality ATF that meets the Type F specification but is designed for classic cars. These are formulated to be compatible with the seals and materials used in older transmissions. Looking for a fluid specifically marketed as "Type F compatible" for classic cars is the best approach.
Do not use Dexron or Mercon fluids; they're incompatible with the 727's friction modifiers. Using the wrong fluid can severely damage your transmission.
