Firstly a massive thank you to Neil Harris who went and found these for me and sent them to me via the Yass intelligence service.
Agents name was Max H. (No wait, that's to obvious. Lets call him M. Hedges)
Neil has done all this for me and has asked for nothing in return. Cant thank you enough Neil.
It is confirmed...... the brakes on the front of this beast are definitley GMC. Apart from being identical when put next to the original set out the truck, so to is the part no 3822R44.
It leads to further areas of interest which may tell us what was originally on the back. What orders of these Chevy Trucks came to Australia with the heavier front axle and GMC brakes in 30cwt configuration?
A quick guess would be ambulances......
Can finally proceed with making the thing stop as well as go
Thanks also to Matt McMahon for his help. I would have been stuffed without it fella's...
Photo's. Left - Traditional Chev set up. Right - Actual set up on truck, GMC