08 and dirty fluid? How many miles on the F-150? Any warranty still in effect? If still under warranty, bring it in asap for service, If no warranty, change the fluid asap. Drop the pan and change the filter too. DON'T go to one of those shops that siphon out the fluid. You are left with a dirty filter, and I have heard of damage done to the trans. from that method. Most transmissions have a magnet in the bottom of the pan. It catches small metal particles and needs to be cleaned off. I'm hoping there is no damage to your trans, but if the fluid looks dirty, and it feels like it is slipping, it is probably due to excessive wear to components.
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