Putting truck in 4WD then shutting it off
 

My driveway is a pretty steep grade, 2 cars deep out to the street, dash shows it’s an 8 degree slope. My old truck actually slid out of the driveway on several occasions in the snow. I came home from vacation last week to a light dusting, turned on my r wheel drive and backed in, 2 tires in a bare spot where my daughter parked, 2 in the snow. I left it in 4X4 so I had a little extra holding it in place with the front axle locked in. Made me wonder the next day, with auto hubs does the 4WD stay engaged after turning off the truck and vacuum is gone?

yes it will stay engaged. Even after you take it out of 4 wheel drive it takes a bit before the hubs unlock.

You can leave the hubs in lock to make sure. Then just used the switch to lock up the transfer case in and out as needed until the thaw

Just don't park a car next to it.

In 2wd it'll slide on the ice straight down, but at work, if parked in 4wd, the trucks would turn a little and hit each other.

will leaving the hubs locked cause binding during turns?

If you are in 2wd no, I have manual hubs and I leave them locked all winter and just shift in and out of 4x4 when I need to.

Only when in 4X4 will it bind on a hard surface with no tire slippage. Just remember to take it out of 4X4 when you get on the highway. Also when in 4X4 you really only have one front wheel and one rear wheel holding when in park. If you put your parking brakes on that will hold both rear wheels

No even if you have open differentials when the drive shaft is locked one wheel can't spin without the other wheel spinning in the opposite direction. When parked in 4x4 all 4 tires are holding.

THAT is good to know. Never would have thought of that.