available rearend ratios

[Ackattack]

I have a 12 bolt out of a 73+ in my 69 pickup. It has 285/70/15 tires on the back and sm465 tranny.

Tonight I took it out on the highway for the first time to see what the rpms were like. At 65 it was only turning 2000 rpms. About 1900 at 60.

Based on ideal tires height and what not, this puts me somewhere between a 3.07 and a 2.73. I know the 3.07s were available in the 67-72s, were they available in the 73+. Was there any higher gears like 2.73?

I obvioiusly haven't popped the rearend cover, other wise I'd just read it off the ring gear.