So I discovered today that my speedo is off and the odometer claims I have put on nearly 70 miles since I bought the car. I couldn't have put more than 30 miles on it. The car is an 84 Hurst olds so it has a 3.73 gear and a 200-4r. Is there any numbers on the trans to see if it is original to the car? It only has 38,3xx miles on it and a nearly new set of eagle gt tires. I know the car was bought by the PO in 2000 and parked soon after. I get the feeling it sat long before that due to the paint being very faded. The speedo housing is stuck but I think it has the a green gear in it when it should be blue. My current theory is the trans blew and it sat for along time and some one threw a random 200-4r in it. The speedo is not off by alot gauge say 35 and the car is actually at 30. Gauge says 30 car is going 25. Could it just be a gear is missing a tooth?