I've got a 2001 F-150 4x4 with 92,000 kilometers.Between 60 to 80 kph the tranny doesn't shift smoothly.It doesn't want to upshift.Instead it kind of ''hunts'' while the rpm jumps a few hundred up and down.If I keep accelerating up to highway speed it seems ok.At lower speeds it's also fine.Same with highway travel.It does this with the overdrive on or off.Anyone ever had this problem or heard about it?Any ideas will be greatly appreciated.I know I'll end up having to take it to a garage,but I'm kind of wanting to know how much this is going to hurt.