Rear locking hubs?

Are there locking hubs available for our rear D70's?
Thanks,
Mikel

Do you mean a way to make the rear wheels spin without the axles spinning?

or

A way to make both rear wheels spin at the same time and speed or be 'locked' up?

Just what locking hubs do, disconnect the wheels from the axles.

Why?

I'm playing with the idea of some day turning my jeep into 6x6 using a NP205 with two rear outputs. I just don't want all four rear wheels to be powered at the same time.

Cool idea!

What about putting a t-case between the axles?

or

Something like tractor PTO's have that allow something to freewheel and then lock up when you want?

or

Wait, how are you going to get two rear outputs from a 205? I can see it with a 200, but not a 205.

or

Using all front axles? That way, they are designed for lockouts and you will have 6 wheel steering.