My 1941 3/4 ton has open/closed driveshaft. Here's a pic showing the carrier and both sides. I can look at my shop manual tonight as to the differences between the 3/4 and 1 ton. I know the frame is the same style but may be longer on the 1 ton.

[img]http://www.chromeplated.com/photos/B2867E26-0878-4807-92B7-B4E18378CD65.jpg[/img]