hey, hows it goin, i have a 70 challenger r/t convertible, it has the 383 with a 4speed, i need to go back as original as possible, but i cant seem to find anything to tell me what the original rear gears would have been, the previous owner of the car thought they may have been changed, i assume for better fuel economy, buit the fender tag doesnt specify anything for me... any help?