my 40 250 is a semi enclosed driveline that being closed from the tranny to the carrier bearing then open the rest of the way with 4.56 axle. with a timkin split rear with duals
Until you get to the Timkin rear it sounds just like a 3/4-ton of a few years later.
Any idea when the change over to fully open drive occured? I had a '50 1-ton that I know was fully open.
