It's incredible! Thanks for this amazing picture! (BTW, could I show it on my blog?)
Just to let peoples know, I got diff leaks. On my 6x6 712, when I drained rear diffs, I discover that the rearest one was nearly full (3/4, due to leak in parking brake). Worse, intermediate one was nearly empty (1/4). I was starting to fear!
I decided to disassemble everything on the drive line, including transfer box.
After opening them up, I understood why intermediate diff was leaking a lot. Intermediate drive shaft had been trimmed with time. This unbalanced tork propagated itself to seals, and made them totally useless.
On this same diff, a dumb man repair was done before. On axle sop ring (the one with long term grease, who apply on ball cup), oring was bad. A guy poor everything with silicon...
Fortunately, vibrations didn't propagated to axle bearings and wheels satellites. I finally changed all o-rings, driving shaft bearings (in witch hat), and intermediate driving shaft (including female receiver). Intermediate axle is expensive (1200 USD), but it is the only solution.

Before assembly, everything cleaned and checked (or changed)

"Brand" new intermediate diff. Rear diff will follow.
I also rebuild the transfer box, as it was leaking through selector fork, and I suspected a "jump to neutral" trouble. It's fine now
