What kind of tranny fluid for a c-6 - 1969 f250
#1
#2
There's those that will tell you that you should run Type F (Ford's recommendations at the time the truck was produced) no matter what. It's my belief that if the tranny hasn't been rebuilt recently, you should have Type F in it. If the tranny has been rebuilt recently, then Dexron will be just fine. The reason I say this is because the materials used when building today's clutches and bands are compatible with Dexron.
If your trans is slipping now, it may already be too late. You could try draining the Dexron out of it and putting Type F in, but the band and the clutches are already impregnated with Dexron and if they have been slipping for a while, then they are most likely glazed and different oil may not help. How is it from 2nd to 3rd? You might try adjusting the band and see if that makes any difference.
Good luck-
Joe
If your trans is slipping now, it may already be too late. You could try draining the Dexron out of it and putting Type F in, but the band and the clutches are already impregnated with Dexron and if they have been slipping for a while, then they are most likely glazed and different oil may not help. How is it from 2nd to 3rd? You might try adjusting the band and see if that makes any difference.
Good luck-
Joe
#3
I had the same problem. I had someone dump dexron into my tranny, and it slipped. I was told to change it back to type F and it worked. Seems to use more fluid, but the type F did the trick. Just drain the torque convertor also, and make sure as much fluid comes out as possible. Good Luck -Fatty
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