? on 4x operation/shifting

[dudevato]

I've a '73 3/4 ton GMC with a granny low then 3 more forward gears and manual locking hubs.

Of course I drive normally in 2 wd high

My question is when pulling my boat out of the water and up the ramp can I (while stopped) shift into 4 wl and use granny low without locking the hubs, without doing any damage? It makes sense to me this is safe but I'd like to see what a few posters say about it.

This would be just to the top of the ramp. I want to know what I can and can't do with this fine new toy - thanks