8 3/4 rear dimensions

cosgig said
They moved the vent tube down on the tube for the 70 model year.

I thought it was around that time frame.

cosgig said
The center is also before 69, as the 742 was discontinued in 69

The gears seem to be December of 66.
I haven't cleaned it up yet so I only saw the date Im not sure what the ratio is yet but in is either 2.94( or the like) or 3.23 My buddy counted slightly greater then 3 turns to one wheel turn and I counted 3

Ill have to count the teeth