Bob, I don't think the '66 or '67 Valiants were available with the 8-3/4. However, I know the 8-3/4 was available in the '67 Dart. A friend of mine had a '67 Dart GTS that was ordered from the factory with a 383, 727 torqueflite, front disc brakes (non-power), and the 8-3/4 rear end. Not very...