Hi Scotty, I asked you about a fuel issue that I have been having and i took your advice. I have yet another question so I will ask away. Could you explain to me why my 2000 f 150 has a straight drive transmission the strange thing is that the owners manual said to replace the internals with automatic transmission fluid. But my question is can you explain to me why do they ask you to replace it with transmission fluid instead of gear oil?

That's just the design of many modern standard trannys, they use automatic transmission fluid. Engineers know why, I just know some are made that way