Just wanted to throw an idea out to you all .
Why not use 2 smaller calipers .
2 Per side one at the 12 o'clock position and one at 6 o'clock .Say 2 full size GM calipers and a 12" or 13" disk this way you keep the stock hubs and axel . The only 2 pitfalls I can see would be bleeding the bottom calipers but if you used flex hose for the lines you could take it off put a piece of wood between the pads and hold in the upright position while they are blead .
The other you would have to increase the fluid capacity of the reservoir or watch the level in the stock reservoir very carefully .
Lots of caliper brackets out there for these calipers , you would have to only buy one set and copy them for the other side .
If you go to the rockauto website you can find the disks and calipers real easy at pretty decent prices .
I'm going to look into this later for my truck .
As I said just a thought
Paul
1948 2 ton

Last edited by PAUL NOLZ; 09/11/2014 7:23 PM.
1948 Chevy 2 ton flatbed ex fire truck , and various motorcycles .