To remove the gearboxes alone and without too many problems, I created a support.
Here are the panels:
To For remove gearboxes, simply attach the jack / support on the support components.
You must keep the engine in place with 2 threaded rods and a piece of angled iron. This arrangement, unlike a ground support allows me to move the vehicle after removing the gearbox.
Then tilt the engine / gearbox by lowering the jack in the boxes and unscrewing nuts simultaneously of the threaded rods that hold the motor.
After having removed the clutch, it is necessary to push back the gearboxes with the jack.
Then lower the jack,
Lift the rear of the Jeep,
Then remove it.