How can i identify what transmission is in my car? I cannot use the vin tag as it states the car has a 3-speed and the car is an auto. is there some sort of marking on the transmission i should look for? i believe it's a c4 but i am still unsure. the idiot who owned it before my friend, took out the 3-speed and put in an auto. need to know because i am looking to put in a 5.0 and need to order parts.