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.
![Image](http://www.exurbis.com/wp-content/uploads/2015/04/IMG_7934.jpg)
Before assembly, everything cleaned and checked (or changed)
![Image](http://www.exurbis.com/wp-content/uploads/2015/04/IMG_7949.jpg)
"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
![Image](http://www.exurbis.com/wp-content/uploads/2015/03/IMG_7822.jpg)