I am having a little trouble with the code on the rear axle of my Nova. The code is just like this C BT 1009 G2. My question is since there is a space between the C & BT is this a 68 or 70 and what is the 2 at the end? I have it as a 68 or 70 wiht 3.55 built in Oct. on the 9th day. Detroit gear and axle but can't find the 2 which is supposed to be the posi code.