truck will go in park neutral reverse but not drive.
I have an old ford f 150 automatic with a c6 transmission. Bought the truck and it ran great then the drive went out. It can go in park, neutral, and reverse but not drive any more. Truck has full power in reverse but none in drive. The other day I changed the fluid, filter and gaskets on the trans and it would go in drive but not all the way, if I barley pushed on the gas the truck would move forward but if I pushed any harder the rpms would just go up. I drove a block and the drive went out all together again. Reverse still works full power. The old fluid was pretty burnt.

