Forum Discussion

Lisaredsgv's avatar
Lisaredsgv
Explorer
Apr 10, 2023

Transmission fluid type

I have 1976 Dodge F40 motorhome and I'm trying to find out what type of transmission
fluid to use in it
  • Type F. But in reality any atf will work in an old slush box. However I’d stay away from synthetic and newer fluids that are high in detergents.
    But you don’t say whether it’s a rebuild, or drain n fill or flush or just adding because it’s low.
    The answer could be different depending what you’re adding fluid for but type F will work for all.
  • Nv_Guy's avatar
    Nv_Guy
    Explorer III
    I would say Dexron, as it most likely has a 727 Torqueflite trans. Back then you had two choices Type F (Ford) or Dexron. You could use Type F, but you wanted a complete drain and refill. Supposedly the Type F would give you firmer shifts.