The over drive light comes on and the overdrive light switch starts blinking

First the truck won't start with the ignition, to start I have to open the ignition switch, then go to the front of the truck and hot wire the starter solenoid, once the truck starts the abs light comes on. As I drive down the road the transmission don't want to shift. And starts to jump low to high, and vice, versa. Then the over drive light comes on and the overdrive light switch starts blinking. I checked all the fuses, tried a new ignition switch and still the same, so I took out the new ignition switch and put back the old one.I don't know what else to do. Thank you.
tony