Hi I have a 2003 f150 supercrew and I have never had a problem with it but yeasterday the 4x4 light and low range light came on and the 4 whel drive switch is on 2 wheel and when I try to switch it over it does not work, also when I drive it the it takes longer to go faster and it keeps jumping, I have tried to unplug the power to reset the computer but that had not worked thanks.

 

might be the slector switch sorry but it's a dealership only item i replaced mine it was acting up like that let me know how it goes good luck