COULD A 1969 Z/28 HAVE CAME FROM THE FACTORY WITH A 373 GEAR NON POSIĀ ??? IT HAS A BO CODE ON THE TUBE
Yes, posi was optional.
Posi optional, and 3.73 was the highest, lowest numerically, ratio for Zs.
Any ratio was available, 3.73 was the lowest gear you could get without a posi. 4.10 + all had posi's.