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