Thanks to all for your help on the mystery. A little more light has been shed as the truck is now home from the painters. Measuring the chassis and the general configuration tells me it is a 3/4 ton.
-It is equiped with the 2 1/2" spring hangers but has 2" springs with the 1/2 " spacer.
-It has the 1940/41, 3/4 ton light duty 10 bolt differential.
-125" wheelbase
-6 bolt 14" drums.

The more practical problem I have is identifying the diff housing and establishing what parts to purchase for the rebuild. I will add some photos presently. Anyhelp in identifying would be great, there will be a few Coopers Pale Ale in for you (when you visit Australia next).

Now the mystery is, as biggadswingdaddy pointed out, the question of it's age, is it a 1940 or a 1946 or somewhere in between?

Here's the link http://photobucket.com/1946GMCidentificationviews


Thanks fellas.

Last edited by Jayde; 03/07/2012 1:53 PM.