Please help everyone. I have a 2000 F150 4x4 with 200,000 miles on it. I can shift from 1st into 2nd but it either sticks or drops out of 3rd. To get it to go into 3rd I have to kind of gun it and it'll squel into 3rd then drop out. Sometimes my dash lights go out so Im not sure if its a sensor, wiring harness, clutch, or gears or any other possible reasons. I really need help on this so ask anything and say anything.

Thanks.