My mistake The option code is D21 for the trans, and as for the rear it is A33 Had moment of C.R.S.Looked up the D21 shows to be 4 speed manual trans.The A33 shows to be track pack dana 60 with 3.54 gear.
I had that same package in a 69 super B and if no one has changed the tranny, for some obscure reason, it will be an 18 spline. I had the same 9 3/4 Dana but I did add dual 4's, headers and a wild cam. it was a hoot but the front drum brakes sucked.
