I think the 40 13 is a 308 gear ratio, but what year is it? Does the 8 mean 68? I think it is a 4 pinion posi also but am not 100% sure. Answers to these question will determine if it gets used or sold.
Contact Monzaz (Jim Mitschke) here on the board. Also, his email is Mitschke454@windstream.net. He owns JD Race and is an expert rearend guy- he should be able to help you.
