Is it a 3 speed or 4-speed (overdrive) auto. Both can have the electric lock-up. If its a 3-speed with lock-up it will have a one wire connector on the back left side of the trans and if a 4-speed it will have 3 terminal plug on the left side of the trans facing upwards behind where the linkage goes on the valve body shaft. I am not talking about the neutral saftey switch plug as they will both have that. If its a 3-speed without lock-up the only plug it will have is the 3 terminal NSS and not the single connector in the rear. The 4-speed will have the 3 terminal connector on the left side facing up but you will have to look in the connector to see if it has 2 or 3 terminal pins in it. If 2 its just a non lock-up 4-speed overdrive trans and it it has 3 pins it has the lock-up also. Ron