97 5.0l weird transmission problem?

my friends truck is messed up. when your driveing, the spedometer, tachometer, odometer, and trip odometer doesnt work. his c/e light was on so i plugged in my scanner and got codes for the TCC. when i drove the truck it has no power when i steep it to the floor. what could be wrong?
here are codes i got P0740, P0753, P0758, P0785, P1860

Bad ignition switch (not the part you stick your key into).

are they hard to replace yourself? i read about it when i googled it so yeah i know what part you are talking about. just not sure if i can conquer this myself or have someone else do it