I have an 85 Coupe Deville that is Knocking when I step on the gas. I took the car to a repair shop and they said it was valves and would cost a lot to fix. I then went and bought a 79 Coupe for 700.00. Now I cant get rid of the 85 junkyards will give me up to 50.00. LOL I just spent 500.00 on a tranny. Now here is where I need help this guy at the Junkyard said a 4.5 will fit into the 85 is this true?