Re: forgot what trans fluid...
look at the top of the dip stick. It should say Dexron, MercronIII or Mercron V As old as it is, I beleive its the Dexron/Mercron (thats what my 97 F350 uses) Your owners manual will also say.
Just be sure to use the right one, merc V in thhe wrong trans will cause it to slip a little under very high loads and overheat.
2005 FX4 Level 2 Ranger 4.0L
97 F350 Powerstroke
1964 &66 Fairlanes