I have a 99 250 super duty 5.4 liter 2 wheel drive truck with 95000 on it. The truck is a 5 speed manual and in higher rpms in gears 3 through 5 it makes a chattering noise. When you put your ear on the shifter you cant hear it but it is coming from the trans area. The U joints are tight and the truck has been taken care of and should not be bearings but sounds like it. What do you think? It is getting noiser so got to find out what is going on.